I listened to the S5e, S6e and S8e's this weekend.
I didn't rate the 5's at all - they weren't bad, but they didn't have the wow factor. They'd be good if you really were pushed for space.
The 6's were "nice". Good all-rounders, but again - no wow factor.
The 8's were better, but they are big.
Interestingly, Mr Incredibly Clever Hi-Fi Dealer had a pair of PMC GB1's setup for me to listen to. I hadn't even thought of these as an option, and they definately had the wow factor, especially in terms of hi end, soundstage and locking things to the centre so much I had to check the centre channel wasn't being used. I was very impressed that he'd nailed what I was looking for pretty much before we'd even started demo's.
In my case I'll want them backed up by a sub, both for 5.1 and for music. They're just too small to provide much punch, but as I need small and I need a sub for 5.1, it isn't a problem for me.