The HPX PMAS was the only option until about a year ago when Uprev made their own. The HPX MAF's are very reliable, but have lower resolution than the MAF GT, and there is some variance in the voltage readings between sensors making it more difficult to get a consistent tune. The MAF GT allows for a lot more fine-tuning.
I'm 99% sure that the GTM MAF is nothing more than a rebranded Uprev MAF GT. Just like their "GTM spec ecu reflash".... its just an Uprev reflash that GTM calls their own, and they sell enough of it that Uprev lets them.
In the rom editor there is an option to select either stock MAF, Uprev MAF GT, or HPX PMAS, and it is all precalibrated. Nothing for the GTM MAF, but then again if its really an uprev maf without the label on it then you would just select MAF GT.
There was a bad batch of MAF GT's last summer that were failing, but to the best of my knowledge that was straightened out and I haven't heard of any failing recently. Anyways if they do fail uprev will warranty them pretty easily.
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