I use the 9.56grain streamline domes in my 0.177 HW100. They're the ones with a slightly pointed dome similar to h&n baracuda match. In that gun they are unbelievable. Far better than anything else.
In my HW44 they're tied with the AA 10.3 grainers as it's favourite pellet.
I have some shooting buddies that have tried the lighter 8 grain domes and they found them very similar to jsb 8.44's. Some of those guys tried the streamlines and they they mostly ranged from similar to better than JSB, with only one gun hating them for whatever reason.
Overall they're very well made and consistency and finish are exceptional. Bottom line is they're at least as good as JSB, and better in some guns. Might be they're currently pushing out lower volume batches of their sporting pellets than H&N and jsb, allowing for better quality? Just a guess really. Either way I bought a ton of them. Well worth getting some to try at least. And the streamlines are the ones I'd try first.