A drummer I was playing with once compared my playing on a particular track to Andy Fraser. Given that this drummer was a mardy git who hardly ever complimented anybody and that Andy Fraser is one of my bass gods, it really made my day.
I've had a few comments from audience members at gigs how I held certain songs together.
But one I remember most of all was overhearing the singer in one of my originals bands telling someone - "Technically, he ain't the best bass player in the world, but what he does is always absolutely spot on. More often than not, his bass lines MAKE the song."
That was a while back - I've worked on my technique a bit since then!