I've done it...mostly for the novelty of it.
Also, I needed a little bit of ammo to use in places where case recovery was going to be next to impossible.
The problems I found are, (as mentioned) small flash holes that will let the decapping pin punch out the old primer, but grab it on the downstroke of the press ram. Then it pulls the decapping pin out of the die.
Also, if you're not really careful, you'll end up with a Berdan primed case (a make other than Wolf) and break or damage the decapping pin.
They are hard to resize, ugly as hell, and in general, not very well made.
The primer holes are sometimes oversized, the cases get bend up really easy and don't resize/expand correctly, the case lengths are all over the place, a steel case will all but destroy a trimmer cutter, the list goes on.
If you can afford to buy Wolf ammo to shoot for the cases, you can afford to buy some decent brass to reload. I don't recommend reloading steel/bi-metal cases, it's really not worth it.
I too, have long since stopped the practice. I found it was a whole lot easier to lose some brass cases, rather than to fight with the steel ones for reloading.
As always, your mileage may vary.