There are too many variants of the G1W out there so you can't really say as they all differ due to them all trying to build the cheapest version - the G1W-C is the best option out the lot as it's a capacitor so the issue of the battery is gone. It's pot luck as to whether you'd get a good one though. Like
@jokiin says in the other thread what the manufacturers sometimes say they can do and what they can actually do are two different things.
I took a punt on the DOD LS460W when that was released and the day and night performance was great - until the weather got warm at which point it lost focus for 30 mins until the AC cooled it back down again - and I'm in the UK so it's not even as though we have that hot weather here!
I spent my own cash buying Panoramas (2x Gs and an X2) to get the good parking modes which other than the other higher end Korean cameras nothing still matches - don't get me wrong they're still not quite perfect, but they do tick more boxes than anything else
I know it's not cost effective but I'm currently permanently running the Panorama X2 up front and back and have the Mini 0806 in the front as well - that way I've got the best of both worlds - super high resolution 2560x1080p for catching numberplates, the Sony sensor in the Panorama to get a brighter image throughout the day (it makes more of a difference at dusk and dawn), the Sony sensor for sharper night time footage and then the Coach CPU in the Panorama for the parking modes (the Mini only runs while the engine is on). That combination matches anything on the market that I can think of.
If someone can create a camera that had the day performance of the higher end Novatek cameras (when they're in focus), the overall performance of the Exmor sensor in the likes of the X2, the parking modes of the X2 and the low power of the Coach CPU then that would be great! I can only dream
One thing I would add from observing on here the last year is that from a customer support angle if I was in the USA I'd buy from
@Pier28, in the EU
@niko has just started covering the EU and you have the likes of
@JooVuu covering both,
@alexsoll covers Russia, you've got
@jokiin over in Australia selling via various retail chains and then if I wanted to save some cash I'd order from the likes of FoxOffer or Gearbest and so on who sell from China.
Buying from Amazon is great for the first 30 days when they cover you with all Marketplace sales but then you're on your own with the seller and it's only when things go tits up that you find out what customer service is. Direct from Amazon is safe as they have a great returns policy like you say but their actual stock can be limited.