The previous accelerator was good. They helped raise some decent money after their initial injection of money. Mentors were great too and the connections we built were useful. It has hard to know if this one will be better.
That is interesting that you wouldn't recommend and accelerator if you don't have PMF. Most start-ups that get into accelerators seem like they do not have PMF (judging from their website). However, I do see your point as you won't make the most use of your time.