Sonny Software

I am new to the reference managers and I am choosing in between yours and Sente, or Mendeley.
Could you please give me your brief comments to all three and their differences from your perspective, it would help me a lot,
best regards,
Ladislav.

I asked ladislav to post this question on the forum so that others who are familiar with these apps can give their informed opinions. I'll do my best to not butt in (although I may interject informational comments about Bookends).

Jon
Sonny Software