Hi Jennifer! We recently switched to Better Impact from Volgistics (which we had for over 10 years). Volgistics has been making some long-overdue updates, but it was too late for us. So far we're happy with Better Impact and like how flexible it is, even though the many ways of setting it up was overwhelming at first.
When I was researching alternatives to Volgistics, I put together a comparison spreadsheet of various features. If you email me at lizaj@multcolib.org I'd be happy to share a copy with you.