I don't know how the full version of PocketMac is, but the "lite" version is worthless. I bought it ($15) because all I needed was a way to sync my iCal to something portable - like the calendar on the pocketpc.
I decided not to buy the full version because I have a PC to install software, and I have a way to transfer files via an SD card. I really only needed a calendar sync solution.
PocketMac Lite is not able to sync the calendars at all, and the first version I tried ran my cpu at 100%, even after I supposedly quit the application. Finally my mac would freeze and need to be restarted.
Naturally, I e-mailed them. For about a week they seemed to care. And they did finally create a version that doesn't freeze the computer. But, they have been unable to solve the sync problem, and they seem to have stopped trying (this has been going on since October). No one has offered to give me my money back. No one has offered me a product that works. My solution is to sync my calendar with my iPod, so at least I can *look* at it, even if I can't edit it on the road.
I would definitely not purchase anything from them again, and I can't advise people to buy from them either. I have no experience with Missing Sync, but they really couldn't be any worse than the PocketMac people, and maybe their product actually works.