The Stetsbar actually works remarkably well. In feel at least, I find it more like a Floyd Rose than a Strat trem, and nothing at all like a Bigsby. I'm sure someone will disagree :)
The Les Trem is much more subtle, definitely more gentle wobbles. I was amazed to see it on sale somewhere recently for over $300! i seem to remember it being about £80, and it's a very simple device.
The E.S. is a fantastic little guitar. with the stock pickups it sounds really nice, so i'm hoping whatever I eventually put in, be it Stormy Mondays or Filtertrons, will sound amazing. It's made me really want a Gibson Les Paul Florentine, and sent me in the direction of that Gretsch