Here is my take on the H&R single shots. They are cheap, and can be made into decent shooters. It takes some work to get them working acceptably.
The triggers are absolutely horrible, but that can be fixed. Due to the way the forearm and barrel are attached, they will string shots as the barrel heats up. You can do a few things to minimize this, but it will happen.
I own one, and it is a decent shooter. Would I own another, probably not. As others have said, you can pick up the Stevens 200 for just a little more, but will have a MUCH better gun.