I purchased my first Axim51 524Mhz in November, 4 weeks later it locked up on me and after a soft and a hard reboot, I could not get it to reboot at all, anyway that was what Dell reps recomended. Over 21 days later i sent it back, of course with restocking fees etc, I agreed to it because I liked this PDA. Well to make a story short, next thing I did, was to upgrade to the 624Mhz Axim51v.. well three PDA`s later I asked for the money back, because they were all doing the same thing, let me explain, it started with the screen adjustments, clicked next, time zone, clicked next, first popup screen, clicked next, and on the next popup screen, they would all lockup on the same popup screen and there was no return no matter what you did, soft reboot, hard reboot, sycronizing, I even tried updating the ROM but it would not let me, because the damm things, have not booted all the way to be able do a ROM update. If there are any problems outhere with this PDA`s I would like to know. By the way, their delivery service was exellent within a week and one half, I had all three PDA`s in my hands, ready to ship back to Dell.
