Hi Jeff,
I bought the Performance Pro 250mm sliding mitre saw from B&Q last year and can honestly say i've experienced excellent service from it. It has ably coped with a very large ranch fence(ok so accuracy not critical here!), a raised deck with stairs. rails etc, a double bed(indoor project so had to be a good job!) and a mahogany table.
Just make sure it's all set up correctly, remembering the one you see on display has had all manner of folks having a pull at it with some not being too canny.
It did not cost the earth but with a good quality blade fitted post purchase to replace the one supplied, in my opinion it's been well worth the money.
Hope this helps Jeff,
Regards,
Graham