Yep!
First it was my PA1-X Pro (upgraded from my Roland VA-7) the difference between the two was night and day as far as I was concerned, and the comments I got on the first few gigs with it (from regulars) proved that.
(Naturally, the comments I got about our Bose L1 Model 2 system were just out of control...!)
I've been told more than once that audiences don't "notice things" about an act (equipment, playing, Singing) that's a load of crap.
Ya know, now that I think about it, we played a gig just last night where we had to use the Venue's system (A couple of big Mackie Top bins and two Bass bins) because of sound restrictions (loooong story - don't ask!)
anyhoo -
the people who had seen us there before told me how much of a downgrade our sound was from our "funny lookin' Bose Pole". Somebody even told me when I talked they couldn't hardly understand a word I was saying!
This was a venue we had only played for the THIRD TIME!
I never never NEVER underestimate our audiences.