It's a great device with a top notch screen and can be had for less than $200.00. 33mhz processor and 8 meg of internal memory with a MemoryStick expansion slot. For a few dollars more you can still get T665s which improves over the 615 by adding a 66mhz processor and upping the memory to 16 meg of internal memory as well as adding MP3 capability. Both are slim and easy to use and have Li-on batteries.
When my Clie 710 (older, larger model) died recently, I replaced it with a Palm Tungsten T which I think smokes all the other Palm OS devices for size and speed, but of course all that comes at a price. The MP3 equipped Sonys actually sound a little better than the Tungsten because they have a hardware MP3 decoder, where the Tungsten T does it in software, but that's the least important part of a PDA to me.
jmx