I’ve been there recently, and I’ll go back again. I like the school and the teachers.
My challenge with TMI is with their lack of coordination in getting signed up. Just keep working it. It’s easy to register if you walk in and there is a class at your level open. But if not, the coordination on a future class isn’t the best. I once ended up going to another school for a couple months that easily signed me up, but came back to TMI. My friend stayed at the other school.
The 4 similar schools TMI, TCA, TLI, Han in the area (not including the universities) are basically same type of instruction.
This thread http://tw.forumosa.com/t/learning-mandarin-f-t-for-one-year/165715/15 and others in Learning Chinese forum might help.
You can sign for a month and see how you like it.