I am using a Graham 1.5tc that was upgraded to a 2.2 (but still with the SME base). I'm running it on my Gyro SE, which I have heard in my system with a Michell Tecnoarm before (which is a highly modified variant of the Rega RB-250).
In my opinion, it's a fabulous arm. Definitely not bass-shy, it is very consistent from top to bottom. The top end is absolutely fantastic, just so smooth, natural and musical. The arm doesn't add warmth though, so if your system is lean and you're hoping to add some extra warmth, you'll need to do it with the cartridge. It is a marked improvement over the Tecnoarm and is a breeze to set up and adjust.
Everything I've read about the Hadcock indicates that it's pretty tough to deal with, which is why I never seriously considered it for my table. I guess it all depends how comfortable you are dealing with a more tricky arm - but I've never heard (or even seen) a Hadcock.
One thing with the Graham - look for something that comes with their fantastic cartridge-mounting tool. It makes it a breeze to change cartridges and have them set up perfectly in a few minutes. Also, all models can be ordered with an SME base if you prefer, so even a new Phantom can be ordered (but that's not a cheap arm!!!). On the used market, not many 2.0's or later will be found with an SME mount, since it was a custom-order option from that model on.