Right, the dimensions are approx:
Sound bar: 850mm long x 70mm deep x 86mm high
Sub: 250mm wide x 270 deep x 315 high
Set it up and watched it last night. It sounds OK. Better than the TV, no doubt, but I wasn't blown away. Maybe at this price point you can't be and I'm used to a proper AV setup at home. Still, it wasn't bad.
There are no LEDs on the sound bar at all unless you press the remote. I think the sub has a permanent green LED at the bottom right, but I put the sub behind the TV. I think it needs spikes, too, if you're putting it on carpet, but it doesn't have any.
I tried it connected through optical and also with the supplied headphone cable (mini-jack to stereo RCA). With optical, I couldn't get it to go terribly loud. Enough for comfortable listening in a large room. Maybe the TV isn't putting out a very high level via optical. The headphone input gave a much higher max output. Also, quality-wise the the analogue inputs sounded fine so I might just leave it like that. It's easy enough to switch between the two with the remote anyway.
I kinda wish I got the Cambridge Audio, but in the shop it didn't sound any better. Or did it? Arghh. You need to be able to try them at home before buying!
/edit: gotta say I was listening very critically. Everyone else was happy and/or oblivious.