Okay so I bought a 173g proton big dome Relativity from my local store. It had some sharp flashing on its rim still, but luckily whatever mvp uses for its overmold is soft and easy to sand away really fast. I wanted to see how it held up vs my longest discs. For reference I average around 330-360 feet of power on flat ground.
Definitely a huge rim, and I'm finding it a little hard to grip, with its combination of large rim, slick plastic, and big dome. Rim is up there with Boss and Nuke/SS for 25mm big boy rims. This Relativity isn't nearly as flippy as I thought it'd be either, and especially not as glidey as I thought it'd be. This thing flies like a rock for me. It has the ability to get out there decently far on speed alone, but it doesn't like to stay in the air for that long. All my glidiest discs bounce around a little while in flight, and want to fight against dumping into the ground too soon. I'm finding the Relativity doesn't have that proclivity. I can see its speed, but at the same time it never appears to cut through the air as fast as my Goldline Ballista Pro, nor have the glide of the supposed 4 glide Ballista Pro, and definitely not the glide of the Destiny.
It's very angle sensitive too. Even in fairly st rong headwinds, when put on a decent Hyzer, it holds that Hyzer line and dumps left. Put it on a slight anhyzer on a neutral wind, it it turns and burns into the ground. The few times I was able to get a very pretty looking S-flight out of it, it never outdistanced my VIP Destiny or even my lightweight Goldline Ballista Pro. I would say that in most situations, it has around the same stability as my Ballista Pro, except it has the ability to just crash and burn on a turnover, while the Ballista Pro doesn't. I have a super domey pop-top Plasma Catalyst that flies just like my domey GStar Shryke, and I can get consistent right finishing S-flights out of both of them, but the Relativity is such a drastic departure.
I'm gonna say I don't have the arm power for it just yet, but I also want to see what I could do with maybe a Neutron Relativity that isn't quite as domey. I historically have not had good results with very domey discs as I just can't grip them as well, and I've also found that MVP's Neutron plastic to be some of the nicest and grippiest premo plastic on the market.