I've always liked the idea of having a small computer on your wrist (something like a pitboy from FallOut) and although this isn't as functional as what could be made, its still extremely good.
The design is small and lighweight, feels well built and the screen is glossy and smooth. The strap that comes with it is a bit naff, some velcro strap, but its hardly bad.
For whats its worth its pretty good. Its best whenever I get a call and can see on my wrist whos calling me, or if I get a text and can just quickly open it instead of getting my phone out. It also vibrates with a call or a text, useful if you have your phone on silent alot. The battery life seems quite long, I've been wearing it for about 12 hours now and Id take a guess that about 70-80% is remaining.
The plugins are pretty useful - Can check the weather and one which could be very good is the contact caller, combine this with a blutooth headset and won't need to take the phone out for calls anymore!
The only problems I have is that its a new product, and at the moment theres not a great amount of plugins available thats made for it. I hardly use the plugins as much as I use it to check texts and all that, I just wish people who develop more stuff for it. The other problem I have is that its not a NEEDED product - Its brilliant to have on, but then again I could just get my phone out.
No connection problems, runs fine on my Xperia X10 Mini Pro Android 2.1.
I'd say get it if you like your gadgets, its great to have on and you feel like some proper agent type thing pressing button on your wrist to answer calls!