I have no prior knowledge of TFT or Cloud 9 so if someone else comes along with a better idea then by all means prioritise answers.
That thread you linked to suggests to me at a quick glance that TFT may have a slightly shady ownership/management. In theory this shouldn't have any effect on a lesson by lesson basis in that the instructors should be there because they want to work any should give you instruction as per anywhere else.
The only thing I would make extra sure of is that you don't give any money in advance/up front. You have probably read/been given this advice already (I didn't read earlier posts in this thread), even some of the old and good clubs and schools are hitting the dirt at the minute due to the economical climate, but it is even more so the case if there is ANYTHING that may indicate that there is any instability in the operation.