I've heared that the SA-80 is the worst weapon ever. It just keeps blowing up and mag's keep falling out.

I understand that the estetic look of the tompson is appealing to you.
However I prefer the MP-5 for it's ''tactical look'' and because it's used by police and SWAT-teams all over the world.
(I've heared that it will be replaced in America by the M-4 carabine. Pitty really)