Ning Alternatives - make suggestions here

I'm creating this discussion as a way to keep everyone's Ning alternative suggestions in one place.  I've found bits of information throughout this forum but it would be nice to keep everything together.  Below is a small list that I've gathered from my quick searches on this forum.  It would be great if people who have moved on to these alternatives or others can please come back to this thread and share with us your experience.  Please share the pros and cons. I'm looking for stability and it doesn't have to be completely free either.  I'm open and willing to pay for a good product as long as it's reasonable and I'm getting my money's worth.  That's the problem with Ning's current price options.  The features are not worth the price.  I don't want to have to switch again in a year or two so that's why it's important to explore all options before migrating.  Thanks everyone.


http://www.grouply.com/
http://grou.ps/
http://wackwall.com/ 
spruz.com
buddypress.com
onesite.com
vbulletin.com