I don't use any of the programs listed (or any not listed for that matter

) but when I was approached by MyClientSpot about advertising and getting the members involved in giving feedback about the product I took a look at it and liked what I saw, even at that early stage.
Kylie hit on one very crucial aspect of why MyClientSpot is so good - Dave, the architect, literally does take the feedback of VAs using his service and work to add the requested features. You can't ask for more personalized service from any of those other 'big guys'!