Well, lucky for you I have owned both!
The Invert Mini came out with a good amount of quirks and reliability problems. Honestly, most of the things that can be addressed were and the Mini is just as reliable as your next gun with the right love and care.
The TM-7 is a Mini made for woodsball. The technical construction of the Mini and TM-7 are the same. The TM-7 does not chop a lot (does not chop more than the Mini). The eyes work great and everything.
The answer to your question:
The ergonomics and outter shell of the gun are the only differences when it gets down to it. If you like the shoulder stock and foregrip with the ability to abuse a composite shell... TM-7. If you like the speedball feel with an air tank on your shoulder and double triggers for walking (and play speedball more) and like a flashy annodizing job then get the Mini.
Does that make sense?
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