Right, here's my thoughts after a week or so messing with this.
First impressions: Looks interesting, but lack of documentation for other equipment. They say it is easy to add support for other devices and to configure, but it definately needs some work on it. User documentation seems very sparse too. It is however all wiki based, so you can write the documentation yourself!
I haven't taken the plunge yet in buying any new equipment, simply re-using current kit I have lying around. Unfortunately, most of the stuff isn't supported yet, such as using my current MythTV frontends running on epia boards as Media Directors (Pluto frontends).
Controlling from my Symbian phone works well, once I'd figured out how to set it up (Pluto only autodetects nokia symbian phones it seems. Thought my panasonic was a WinXP tablet!). It does drain the batteries somewhat seeing as it is comunicating over bluetooth all the time.
Support from Pluto's web forums is excellent. All my questions have been answered very quickly, but then they are getting free beta testers and developers for next to no work themselves. They do seem to want to help people tho' and their software includes a remote admin utility to allow them to connect to your core server to aid in bug fixing over a secure tunnel. I've yet to have tried this, but plenty of people on the forums seem to get their problems solved.
Got a few things to do over the next week, so I'll probably leave pluto for now until the next release in a few days.
I've also got to read up on X10 and other home automation/security stuff. PBX's, MythTV, linux, etc are all old hat for me, HA is all new stuff! Anyone had experience with Dallas 1-wire/ibutton stuff? Looks interesting for home monitoring/climate control.
Anyway, hopefully the new release will be out soon, and I can put pluto onto a decent sized system (dual Athlon 2000) rather than the current poor Epia based system. Also will be able to try it with some freeview cards and Asterisk.