I think the 1st 2 of these are considered classic, certainly the 1st one which seems to concentrate more on sustain than the impactful dunt of most other Detroit rock. They've been thought of as anglophile and certainly seem more proggy on at least the 2nd lp than most other US bands.
Don't think the 3rd lp is quite as well looked upon though.
Anyway, I'm looking forward to hopefully getting a new decent version of these lps. I've got the first one in its One Way incarnation from about 20 years ago.
Not sure if anything crucial is missing. I think there were a number of outtakes released some time ago. A full lp's worth on a One Way cd plus some bonus tracks on another release.
There were also a couple of live sets circulated a while ago, I think one from '69 featuring Gary Quackenbush before he left and another one from I think '71 when he'd returned before the band morphed into Blue Scepter.
Gary Quackenbush seems to still be playing since a couple of live sets by him have appeared on torrent sites over the last couple of years. One about a month ago.