Hm, that's weird. I just wrote an opposite post. I have a, I dunno, 1999 or 2000 Axim X5. The predecessor to your X51. What an awful, horribly outdated thing I remember it being.
Correct and a completely different PDA that has no business being compared to the X51. 🙂 The HX4700 is the X51's direct competition in terms of features and performance, which is one heck of a competitor.