We bought a 20m and a 30m, installed them and tried to use them. Absolutely no flow through the hoses. The water pressure is about half what it was with a hose connected directly to the tap.
They weren't the cheapest, and would expect better. Taking them back to Bunnings today.

2 years old and the retraction lock is broken! Out of warranty and I have read that this is not a replaceable part. Used once a fortnight on average so poor quality I guess. I had hoped for longer life!

Works a treat, was one of only two that the bracket was connected to the middle of the spool. Many others in the market have the bracket positioned at the bottom of the unit causing strain on the bracket. Whilst it is made out of plastic, rather than steel as many items are these days. It carries a 2 year warranty and as it can be sourced from Bunnings they will help if required. I had previously tried another brand and the changeover was so easy.
Works easy and would buy again if another unit was required.

The rewind mechanism won't move along the whole length of the drum so that the hose is only wound onto one side. Its faded badly and looks crumbly already. A very expensive buy considering this is only the start of its second summer in use

Purchased 3 of these in the last 18 months, all three have failed to brake. Luckily to have been used more than 25 times each and then they fail. Bunnings kindly replaced 1 but I didnt keep receipts for the next 2 and now have 2 that dont work. Not happy and wont be burnt again. Looking at the reviews Im not the only one. Avoid like the plague.

Massive pressure drop. Started leaking from unit. Couldnt work out why it wouldnt retract. I think the main spring has broken. Now its just an expensive normal garden hose. O well. No receipt.

Purchased 2 and I am unhappy with the quality. If you look at the photo you will see that the drum rubs on the notched belt. The side is not rigid so distorts and once the belt ages and loses its flexibility will easily break and it is not user replaceable.
Also Holman on their site have a video of how to replace hose if needed. This is no longer the case as the hose is crimped so the video should be removed.

Bought 2 of these from Bunnings. So far, so good but reading the other reviews I'm not holding out much hope. My main complaint is the massive pressure drop through the internal rotary joint. It really is bad.
UPDATE Dec 2022
I was wrong. The pressure drop is not bad, it is HORRENDOUS. With the end of the hose open, the tap on full, the house pump was able to build up pressure and cutout. Unbelievable.

Had it more than 2 years but obviously not designed to last. Bracket rusting - hose gets jambed - gun is made cheaply and broken - top cover wont close - tug of war beyond 20m - hose bulging in spots - In future will avoid cheap crap from Holman!

Less than twelve months. Hardly used Spring has failed. Pull it out the box and noticed how cheaply it is made. Keep your receipt you will need it. I didn't.

Lasted just long enough for the warranty to run out
The reel failed to clamp hold of the hose
This is a junk product
Do not spend your money on it
Beer would be a better investment

I have made the mistake of buying 2 of these retractable hoses, one for my backyard and the other one for my pool area. I misplaced my receipt and after about 5 months, both are no longer retracting the hose.
Terrible product.

Terrible quality. Lasted less than 6 months until it started to leak from the unit and the retraction system broke around the same time. Holmans customer service just responds with why dont you swap it under warranty. Well, i have many reasons why. Two of these reasons are: 1. What a huge waste of plastic destroying our environment during manufacture and then again rotting in a tip. 2. I cant be bothered keeping my receipts and the only way to replace, is to give Bunnings all my details including drivers license number and address to be able to claim a replacement. Shame on Holman for producing such a throw away product and the only recommendation being to replace replace replace when broken.

We purchased this unit just over 2 years ago and because of travelling, only installed it and started using it in January this year. The unit has over the months got worse when it comes to retracting the hose to now not retracting at all. It looks as the plastic housing the spring has broken away. Considering it has only been in use for 10 months, but out of warranty due to being unopened and in storage for nearly 16 months, we are less than impressed with the quality and standard of this unit.

Bought this to replace my previous Holman 30Mtr retractable which lasted a couple of years hassle free, but this new one doesnt retract as good and never fully rewinds all of the hose without several attempts of tug of war.

Just buy a decent one. These things are no good.
I bought two and both have cut water pressure in half, which is bad if you already have low pressure .
Just no.