No, I do not recommend that. Apple doesn't have as many
hardware issues as other companies. Even then, you have
30 days to exchange it for a new one. You also have a one
year to exchange for a "refurbed" device, which I find to be
one of the better devices with all issues resolved.
I got my 3GS on release day last year and had no issues. As Duvi said, Apple doesn't really have as many hardware issues unlike a lot of other manufacturers. Granted there's always the off-chance there could be an issue (iMac screen problems for example), but they seem to be rare, and again as Duvi said, there's an exchange policy to ensure you get a fully functioning device.
There is another thread with the same info but basically Apple stuff are pretty much bulletproof and if you do have problems you can just take it in to the Apple store and they will diagnose it or replace it. As long as you didn't drop it from your third story window or hit it with a ball-peen hammer