I got this phone for Christmas last year and I've had a very mixed experience with it. Many good and bad points, I will go through all the major points, in my opinion, on the G1.

Battery
First and foremost, the battery life is pretty terrible - even for a smartphone. Sometimes you struggle to even get a full day out of the battery with light usage (no Wi-fi, no GPS, little app usage). This could be amended by purchasing a bigger or spare battery, but ofcourse that costs money.

Android
Fantastic applications available on android, however, can make the phone quite slow to boot up and sometimes prone to freezing/crashing.

Camera
The camera is not great, but it will do. With only something like 1.3mp, you need to be incredibly still whilst taking the image or it will come out too blurry to make out. The video camera is nearly unusable.

Web browsing
Extremely good. Most sites can be browsed no problem - but complex sites (flash etc.) will not run. However, can drain the battery very quickly.

Music
The speaker is very weak on the G1, and you nearly need headphones just to make it audible.

Looks/Ease of Use
It looks a nice phone, with a useful slide out QWERTY keyboard which is much easier to use than an on-screen ('soft') keyboard, but it throws in a couple soft keyboards if you would prefer to use them. You can call quickly and easily using a screen similar to the iPhone's calling screen, and texting is abreeze with the QWERTY keyboard. The touch screen requires more of a press with a finger, than a tap (styluses won't work) to function - but it is accurate and easy to use. Enough buttons to have ease of use, without confusing the user and customisable short cuts make nagivation easy. Uses a

All in all, a good phone. A bit old now, and hopefully the G2 will have solved some of the problems. But with some of the bargains going now on it now, it may be worth the £100-£150 price tag.