Agreed. Not sure where you heard about it ruining counter tops, but I certainly have never experienced that. Mine is that plastic laminate style counter top (you know, the cheap kind). I'm pretty sure if it ruined that stuff it wouldn't do well with plastic buckets, better bottles, etc. Now, if you pour the premixed concentrated Starsan on your counter, I'm not sure what would happen.
Personally, I think Starsan is awesome! Not sure what I would do without it.