I've always had a Garmin in the past, but thought I would give TomTom a try. I really like the large screen of the 620, especially when typing in an address.
The fact that it has WiFi inbuilt is a boon. No more mucking around with cables and PC apps to get updates.
The only downside is that they don't have Japanese as a language option, and my wife would really appreciate that. She's sticking with her Garmin for now.

Originally I gave this product a 5 star review but now after owning it for a period of time I find it has, for me, a major flaw in everyday use. I purchased it mainly for a USA road trip and it served me well in the US. Note that traffic will not work outside of Australia but that was not an issue for me.

The issue is that now I have come back from the US I thought it would serve me well in everyday use by warning me of fixed traffic speed camera locations - it will BUT only if a 'from to' route is entered. In Map mode only there is no warning of cameras or other poi's in fact Map mode is totally useless.

I recently bought a TomTom GO 520 for a return Sydney to Melbourne trip however, to my amazement, the battery powered off prematurely. I recxharged for quite a bit longer however the same thing happened again. I will call TomTom about this but your review says that TomTom won't help. If this is the case, I will contact the Dept of Fair Trading.
Also, you cannot charge the TomTom whilst it is sitting in its holder as they use the same area at the rear of the GO 520. So it needs to sit on the passenger's lap to charge and once charged (1-2 hours worth) its the same routine again. My previous 10 year old GO 720 was far more reliable.

MY original 2006 was perfect but updates became expensive so updated after 2 months stopped working so it was replaced new one intermittently loose satellite signal. Decide to update as displayed on screen after update could not find anywhere in Australia as it removed Australian map and replaced with south east asia tried may times to fix but to no avail, so it looks the rubbish bin will purchase iPad mini, they seem more reliable as it is embarrassing when you stop in traffic and don't know where to go.

Product consistently powers off in the middle of using it. Tried contacting Tom Tom with problem, but since I purchased the product 5 months ago, they refuse to take care of it. Been a Tom Tom costumer for more than 10 years. Seriously disappointed with this product and lack of customer service.

Replaced 340 with 520 due mechanical failure of case attachment bracket. Route Demo is ridiculous, always starts from where you are, even if on the opposite side of the country. Tom Tom said the software will be changed, hasn't happened yet 12 months later. Instructions can be downright incorrect. Often shows distance to random intersections which have no meaning or relevance. All you need to know is how far to next turn. The 340 did this. Keeps you in the left lane and then suddenly announces a right turn within 20 to 50m. The 340 display was better. Having been more than satisfied with the 340 for 9 years this model - and I suspect all current models - behave the same way. Turned the useless and confusing voice instructions off.

If you try to upload an update, you risk losing the whole map, and when that happens, at the drop of a hat, you can't do anything to get the map back. All the customer service do are point you to their online directions - absolutely useless. I have gone back to Garmin after being stranded overseas with no Sat Nav.

Worst gps I have bought to date. Got a blurry screen first time it was switched on and had to be reset. Does not display Street names or intersections. Traffic switches off whenever smartphone screen goes to sleep. One screen theme, colour, pointer and sound - no choices. Not worth the expense or the dreadful service from Tom Tom.