Now that's a blast from the past. I haven't used Vierka lager yeast in 20 years, and didn't even know it was still available.
It wasn't bad. I recall it wasn't exceptionally clean, and I was excited to switch to the liquid lager cultures once they became available. It certainly was a step up from the Red Star lager yeast that I first started brewing with in 1990.
I recall the Munich yeast made a passable bock. But, this was 20 years ago.