I had a Spirit before I had my Jem and recently picked it up again.There was a lot to like. Before I bought this one, I tried the "real" Steinbergers and actually preferred this. Go Figure. The Steiny design has a LOT of pluses.
I have a real love/hate relationship with trems. They're a bitch to tune. With the Steinberger bridge you can easily lock it to tune, and you can decided on the fly if you want a fixed bridge or floating. No locking nuts to lock and unlock. Tuners are right there on the bridge. Drop D is a cinch when locked too. If you break a string the guitar won't go out of tune and changing strings is quick!
The guitars are small and light, so if you need a travel guitar you can't go wrong with this design. The sound is fairly neutral. No particular personality so to speak. Through my tube amp, I wasn't overly impressed, but played through Amplitube it sounds great, in some ways better than my Jem!
Somewhere down the line I'm thinking of changing the pickups. Likely a Seymour Duncan SH4 in the bridge, and a Sustainiac on the neck. Then it'll be killer IMO.