Never heard them before but it looks like it might be a more delicately refined JBL Studio/Northridge type Speaker.
Has the traditional Titanium Dome Tweeter and a 5" Midrange. I bet it will probably have a similar type of sound or probably better than the Studio Series.
It certainly has a more Home theater WAF friendly look to it.
I can't see why it wouldn't go bad with a Denon 3803. JBL products generally give good bang per buck and I'd expect the frequency response to be good since they generally take that as a high priority in design.
JBL is a trusted brand name in Audio though I don't know if I'd spend the amount of money they're asking for the XTI series without hearing them first.