As others have noted, the display is awesome. It has such high resolution that in some applications (Quicksheet, for instance) the font can be made so small that you have to squint to read it, but it is still clear and easily readable. The display of pictures is finally at a useful quality level - on other lower resolution displays it is only a geeky gimick. With the Sony, you can actually enjoy looking at your photos.

The memory stick feature is really great - endless program storage. The speaker is much better than older Palms - still tinny but much less than old models.

Let me start by singing the praises of the Sony's strongest feature, it's beautiful hi-res screen. The colors and resolution blow anything from Visor or Palm away. It's a standard that Pocket PC users take for granted but the hi-res screen really does make a big difference. I wanted it to be able to carry a few wallet pictures around and for that it does look great, however, I wasn't prepared for the difference it would make in more mundane tasks. The font is much more readable in hi-res mode which makes reading ebooks a pleasure but going back to the blocky text of older programs painful.

The metal case makes this PDA look very designer. With my old cell phone the silver paint started to rub off it's case after a couple of years in my pocket. No such fears with the 615; the case is real aluminum and it adds a nice feeling of solidity and strength to it's slim case.

Two problems that some have raised include the battery life and "up/down" button. It's true that the battery doesn't last nearly as long as my old PalmPro, however, that old machine didn't support color or have the backlight running all the time. At work the Clie stays in it's cradle by my side at all times so the battery is always fully charged with no inconvenience. However, I just went away for a 5-day weekend and used the Clie
a lot every day. By the time I got home it was in need of charging but it was still going strong.

As for the "up/down" button, I've read many complaints about this but I really feel you just have to learn how to use it properly. It is not 2 separate buttons as on many Palm devices but more of a toggle. You don't, as I've heard of other people doing, press it with your finger nail. Instead I rest my thumb on it as I read and pull it up or down from that position to scroll my pages. It work very effectively. As for the jog dial,
it seems to be a bit of a gimmick to me but perhaps I just haven't learnt how to use it properly yet.

Going from 2mb to 16mb has been an eye-opener for me. In addition, the availabilty of cheap Memory Sticks makes carrying masses of documentation a simple task. The Sony also comes bundled with plenty of useful software including Documents to Go which is functional enough to invade MS and the Pocket PCs territory again.