> is there any good smooth scrolling PDF viewer (for windows at least)

Seems like the asker is looking for Windows software in this case. Either way, "Get a Mac (...)" sounds a little unreasonable as a solution for "need a better PDF viewer".

Just my $0.02: I'd presume that if a Mac was a better fit for this commenter then they would have switched over already. For some, the extra attention to detail and improved UX of an Apple device is not worth the extra $$$ compared to an equal spec'd PC. There are also other concerns you are probably aware of.