Audio Newbie Question-Asperion Speakers

I am getting back into listening to music and have a Pioneer VSX-519V-K receiver connected to a squeezebox. Was looking at new bookshelf speakers, specifically the Aperion Audio Intimus bookshelf speakers (the 6b or 6c). I was wondering whether the Forum can give me thoughts on the following:

1) Quality of Aperion speakers overall. I have seen several good review, but the reality its hard to find bad reviews on many speakers.

2) Whether the receiver is powerful enough to power the 6Bs, which are a little bigger, as compared to the 5Bs. I know very little about how to make this determination, and could really use some help. If the power will be insufficient, any suggestions on how to handle?

Some additional information is that the speakers will play primarily rock and roll, some jazz/classical. The room is very open, about 20x30 in an open floor plan, with high ceilings.

Thanks in advance for your thoughts.