Just got this set for my Schecter Hellraiser Hybrid PT-7. As I don't have much experience with 7 strings, I usually buy different sets of strings from different brands featuring different gauges so I can have an idea.
I finally had the chance to restring my guitar and tried this set. First, I went for A standard. However, I did not like the tension so much.
After having tried this tuning with NYXL 1164, I decided to go back to Bb standard tuning and I must say I have been really enjoying playing my 7 string with this tuning and tension.
It's really inspiring to play and these string absolutely sound great.
One thing regarding the price tag though:
Although these strings are pretty much priced as premium-ish, I think they are not so different than a regular set of strings.
They immediately start changing colour and I don't see why these are priced so high. Maybe it's because the Daddario brand's logictics, but it doesn't change the fact that they are a bit overpriced for what they offer.
I still recommend anyone who is looking for 7 string guitar strings, especially for lower tunings.