IM a Iphone 3g user and i got it a few days .I used to own the iphone 2g.

IMHO,if u compare the quality of the iphone 2g and the iphone 3g,i ould say that iphone 2g is more solid compared to the 3g version.

In addition to the lagginess or the iphone 3g,rumours has that there will be a firmware 2.1 that we support a better gps and "cure" the lagginess of the iphone 3G....

after using iphone 2g,still feel that the quality is better and the firmware works very good.

maybe it takes time to update the firmware to be better.