From what I could tell from reading up on them a while back, they're not horrible guns if you can do work on them yourself. Like the Aftermath Kraken, they're a good platform to build and upgrade on to get a better gun for less money than buying a similar model band name. You can essentially have a full, pimped out gun for about the price of a stock TM or less. If you're a collector who likes to occasionally plink in your house, then stock TF is good. If you want to use it for gaming, you'll have to sink extra money and work into it to get it up to par.
Pros:
Metal gearboxes
TM compatible
Cheap
Cons:
Parts of questionable quality
Bad shiming and overgreasing of mechbox
Crap batteries
Reliability
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