It looks really nice, I'd love to try it. But we're a small startup (many of the 15 people are part time or consultants) and doubling our expenses on this is more than we can afford.
PT uses tiered pricing, so if you have 16 people we're only $10 more a month than PT and at 26 people we're $40 less expensive each month.
15 * $8.50 = $127.5 vs Pivotal $75 flat. But if I had one more user Pivotal would jump immediately to $150 and Clubhouse would only go up $8.50.
So pretty much you are cheaper at the low end of the ranges but more expensive at the high ends.
Don't get me wrong, this looks awesome! I really want to try it. Maybe when we hit the next user barrier on Pivotal I'll use it as an excuse to switch :)