I was pretty jazzed about getting a new synth with S7 so Dim LE was one of the first features I played with when I got it.
I am sorry to report that it's not that great.
Better than the TTS-1, to be sure. Much better, in fact. I may use it as a temporary placeholder during composition. But if you're serious about realistic instrument sounds, you'll be disappointed. I wouldn't have bought S7 if Dimension LE had been the only addition.
When I listen to the demos on the Garritan site, they sound OK. Does that mean the lite version is intentionally inferior to the full product?