its nice. only downside is catching some people with schedules that are absolutely out of the way, your 11 example would be seen as extreme. but thats a minor inconvenience

i guess the best of both worlds is a mix. a short timerange where everyone needs to be available most of the time and the rest freely chosen. 9-11 is reasonable to demand of everybody, fuck them 11 starters ;-) they take one for the team