They only recently popped up in Canada and their rep reached out to me and sent me some to try out so I can give you my honest thoughts. (Yes, another drum head rant from that guy that doesn't like UV2s). I tried out the Orbit 2, the Royal 1 with the built-in dampening ring, and their double ply head (Thinskin 2 I think?) on a Gretsch Brooklyn and my C&C custom maple kit. (They didn't have a Thin Skin 2 for my 18" floor tom and the replacement head they sent was bent and didn't fit on the tom at all so I never got to use it)
Overall I'd say that Attack heads have a unique sound to them since they use a proprietary film on their heads that gives it a "darker" tone to my ears. Also all the heads I tried had some internal dampening built in which also darkened the tone quite a bit and cut the sustain, which personally, I'm not a fan of. Had I been more involved in choosing the heads, I would have picked something different.
Thinskin 2 (clear) - These were for my toms and sat somewhere between a Remo pinstripe and emperor. These would probably work really well in a live setting but unfortunately I received all the heads before right before lockdown last March so I never got to play them out. These are great if you want a short sustain on your toms, like a pinstripe or hydraulic but I prefer the attack you get from undampened drums (when I can get away with it) so these are just not for me.
Orbit 2 - This head just LOOKS SO COOL. This bass drum head has two independent plies with the bottom ply having massive holes in it so it has some nice give to it but controls the sound nicely. This head sounded particularly good on the Gretsch bass drum (which had no pillow or muffling at all) and had some crazy punch on it. Unfortunately it didn't sound as good on my C&C bass drum (which has always been my best sounding kick, so this was a surprise) but I also had it tuned much more loose and with dampening as well so the head couldn't behave like it is supposed to. The only downside to this head is the cost.
Royal 1 - (Coated). This head and I did not get along very well. As I stated previously I don't care for pre-dampened heads and that's exactly what this thing was. Only it still had a super papery sound. I tried it on a 5" modern Supra, Tama Staclassic Bubinga and my C&C maple and it had that characteristic on all the drums and really only responded well at super high tunings, which sounded choked again because of the dampening. it's hard to describe but there was a bit of the feeling of their being something on top of the head like a thin towel. I also had a good 2-3" of coating wear out in the first month so this head left a really bad impression with me - although people complain about Remo and Evans' coating issues all the time, so I realize this is nothing new. This is also when I found out that other head didn't fit on my 18" floor tom and they refused to send me another one or refund me for anything, so that also soured my experience with this company.
So overall, most of the negatives in my experience were due to personal tastes and not the actual heads. Like every company it had its share of manufacturing flaws, but I'll give Attack this, they have a vibe. That vibe just isn't what I care for. Haha.
Hope that helps. Sorry for this stupid long post
-Jonathan