If I still lived in the UK and if for some reason I grew tired of racing a Laser then I suspect I might seriously consider switching to the Laser SB3. Not because it has the Laser trademark but because it seems that it retains so much of the Laser philosophy of combining fun, convenience and strict one-design rules.
More information here and a couple of videos here and here.
But I live in the US (where there is no SB3 activity as far as I know). And after 25 years my enthusiasm for the original Laser shows no sign of flagging so I guess I will stick with it for another 25 years.