I own a couple Blackhawks, one of them is a 4 5/8" convertible in 45Colt/45ACP. I bought it brand new in 2014 and only have a few hundred rounds through it, but it handles well, shoots straight and is plenty accurate - at least after I reamed out the undersized throats in the cylinder. Some of the Ruger blackhawks have this problem, and some do not - it seems to be mostly an issue with the .45 caliber models. If one is shooting jacketed bullets the throats issue probably won't affect things much, but if you want best accuracy for hunting and accuracy with lead bullets, throat size is an important consideration. If you happen to get one with undersized throats, any gunsmith should be able to ream them out to the proper .4525" DIA. Or, you can get a reamer from Brownells and with a drill chuck and spare 45 Colt case with the head cut off, ream the cylinders yourself with patience and some cutting oil.
I am still working out best loads to use with the ACP and Colt Cylinders to get them close to POA/POI at short distance. Either will make decent sized groups and I consider the gun to be very versatile. And, loading for 45ACP stretches the number of rounds per pound of powder, and 45ACP bullets are cheap.
The hard plastic grips on the new models are not nice, IMO for shooting any sort of "warm" loads. I have alot of fun with the revolver, and it is handy enough for packing in the woods. I have a 7 1/2" bbl 45Colt Blackhawk that I use for short distance deer hunting, too.
These revolvers will outlast your grandkids, if you take care of them.