QUOTE(Jurrasic @ Jul 29 2006, 09:48 PM)

ALso keep in mind, the very few people who brick their units will post about it. The thousands who upgrade successfully with no issues usually won't post about it.

Very true

.
I have
some experance in the bricking arena

.
As said, units that shipped pre-2.0 F/W and as a rule all MK1's are much more prone to bricking problems (the older version of the GP2X U-Boot custom updater did not attempt any checks before fashing your unit with any old sh*t).
Newer MK2's and units that have been upgraded to 2.0 without issues should be fine for the most part. Even if you do brick a unit as long as your not upgrading the bootloader (U-Boot) then you can unbrick (i.e. restore the FS and Kernel) using things like my guide as a starting point.
With tools like the BoB repairing your GP2X even if you break the bootloader is not that hard as long as your unit is not physicaly broke.
The key to doing all you can to aviod bricking is to follow some simple advice.
NEVER upgrade on batts (I have had to fix so many because batts went flat

) - Always use a PSU.
NEVER upgrade if your not sure (why be the 1st if all it does is break your unit) - wait, let others test the water and shout about problems (i.e. the people that can unbrick there units). Give it a few days.