i own the complete waves plugins bundle, including some other top-shelf plugins. as much as i love Waves and cannot imagine a workflow without them, i find myself quite a lot using the straight-forward, basic native Logic plugins... especially the compressor, limiter and EQ. am i insane?
I really like the ssl compressor and channels, but what was said before is the truth. It depends on personal preference and the situation. A ssl comp would probably not fit a metal mix as well as the logic one, but would be better for jazz rock. Best to experiment and find what works the best. Non destructive editing is why digital is great.