I really like mine.
Buckeye Sports had Ruger make a run of Convertible Blackhawks in '90 or '91. I've always been a fan of the 10mm, and had wanted one of the Buckeye 10mm/.38-40 revolvers. But it seems they are always listed at $1200-$1300. Not that I've ever seen one sell for that price, but that seems to be the usual asking price.
So when the Lipseys 10mm/.40 guns were released, I jumped on one. They could be had for just under $600 if one looked. Now that Lipseys is out, the price has gone up some. $700 isn't a bad price for one in today's market, especially considering how all gun prices are up since March.
And then a year or so after buying the stainless 10mm/.40, I stumbled across one of the 10mm/38-40 guns for a reasonable price. So now I have two 10mm Blackhawks.
They're nice in that if you reload you can load longer than you could for a semi-auto, and get a fair bit more velocity out of them. It also helps that you're using a beefy revolver that's way overbuilt for the 10mm.
But now having said that, I usually just shoot "standard" full-powered 10mm through mine. It's not going to be a match for a .41 Mag as some people like to suggest. It's roughly equilavant to the .357 Mag in power. If I need something with more power, I'll use a revolver chambered in a different cartridge. That being said, it's very comfortable to shoot full-powered 10mm through, and the accuracy has been great.