I'm pretty picky about my mikes and had finally found what I thought would be the last one I'd ever need when I did comparisons all day about 10 years ago. The Sennheiser 845 did a great job for me and I still have three of them, but a curiosity comparison with the Audio Technica AE6100 retired my Sennheiser's to where I only use them when I'm in Japan these days.
After reading all the info I could on the Heil PR-35 there was no way I could resist trying to get my hands on one and it showed up on the porch yesterday. It'll probably be a week before I get to try it onstage but with the reviews I've read so far I fully expect it to at least hold it's own, and although I have a hard time thinking of dropping my AE6100's to backup position, I'm definitely ready to be convinced.
It's funny that even though you liked the Heil, you ultimately stuck by your faithful SM58. One of my buddies always resisted whenever I tried to get him to try my Sennheiser's or EV N-Dym's, because he felt completely comfortable with what came out of an SM58, which he was always able to find.
I'll report back after I've had a chance to plug this thing in, and especially when I can do some comparison testing to my to-date favorite, the AE6100.