We have been using these for about 6 yrs now in our open fire in Mount Dandenong (Vic). Took a bit of working out with Smartburn but we have a setup that seems to work for us. We use 2 at a time, primarily to keep the flue clean.
We had to burn a lot of dried cypress early on and have now migrated to local hard wood. Its not our primary heating source, they aren't cheap, but they have certainly done the job with the flue.......

I recently moved to Tasmania & am now using a wood heater. I was introduced to Smart Burn by a local who claimed I would benefit from its use. After installation I noticed a nice clean fire, little or no smoke outside despite lots of smokey fires around me. So for me, it looks good but the jury is still out. I`ve had a chat to my new Woody & he stressed that the quality/ age/ dryness of the fuel used was important given that a lot of green firewood was on offer.

Have been using smart burns for many years, had the flue cleaned after 4 years and only yield about a cup of soot - enough said they work
To the reviewers saying that the glass goes black, its from your wood and from when you damp it down, a hot fire the next day gets rid of it. A unblocked clean flu is more important than a bit of black on the glass - no flu fires

My late husband initially purchased Smart Burn following seeing it on The New Inventors. This product has been a god send to us over the years and more so over the last 2years living by myself. It cleans the flue and I get a lot more value out of my wood. The glass cleaning benefits are a bit hit and miss but I have worked out over time that's usually due to airflow in my heater and sometimes how I manage the wood pile that I load. When I do get black soot on my glass in the corners it's definitely easier to clean using Smart Burn. I just use a bit of ash from the firebox on a cloth and the black clears straight off.

using smart burn not only cleaned the glass but also got rid of the soot build up, will use again next winter for sure
so happy we decided to give this a go after using most of the other products on the market that just didnt do anything. think I used less wood as well .................money well spend

It had no effect at all of the soot build up in my Kent log fire. Contacted the manufacturers who told me to buy two more !!! Even our local retailer returned his stock to his wholesaler after several complaints and angry users. $75.00- its a rip-off !!

Bought a smart burn about 3 weeks ago. Glass is going black more than it did with out the smart burn in it and the wood is burning out every night. Never used to burn out. Somebody got sucked in. Wasted $40.

Haven't noticed any decrease in blackening of the glass on the fireplace. After one week the active (?) ingredient reduced to a size of a pea - and after another week I managed to shake it out of the matel casing. Waste of $39.

This product is the best way I have come up with to keep the fire box and flu drawing cleanly

I bought this as I saw it advertised. What a waste of a lot of money. It does not do as it suggests. My wood stove glass door is black every night even following the directions to the letter. My wood burn time is just the same. Total waste of money.

I have a Nectre Mark 2 wood heater and have used it for 15 years. I purchased the Smart Burn to essentially give it a go and have been both surprised and impressed with the results. There is a lot less ash in the box and it is definitely hotter and the wood burns cleaner and longer. I have mainly messmate and peppermint on my block. I have shut down the fire and it has left some clear blocks of charcoal ready for the next burn. It has definitely had an effect. When this one is used up I will be getting another for sure.
Just an update. Still using the smartburn and still happy with it. However I haven't found that it has cleaned my fire window very much at all. For me it is the longer and hotter burn time that I find is working so well.

Bought the smart burn in hope it would be beneficial. Unfortunately we found no improvement. The fire went out every night. It is normally still burning in the mornings once we shut it down at night. Gave it a go but to no avail for us!