I think Senn sucks not because of the way its headphones sound, generally speaking, but because of the strategic decisions it has made recently. It's odd to me that Senn seeded some forums with proto 700s, but apparently didn't listen to the requests from same about what would be a nice complement to the 800.
As for what I've heard extensively:
HD 25-1
HD 25-1 II
HD 215
HD 280 Pro
HD 580
HD 595
HD 600
HD 650
HD 800
Environments: all kinds, including but not limited to my own home.
Equipment: all kinds of amps, all kinds of DACs, and my johnson.