SMT6:
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Summary: Fuel and Timing control, Extra injector(s) control, NO2 activation, Camm switching activation, temp and boost compensation maps, map switching, O2 Lamda control (however not at same time as regular MAF/AFM/map tuning)......thats almost all the smt6 can do....overall these units are aw some, the only problems I have with them is problematic triggering with Toyota vehicles but is corrected using a resistor from the ground to the crank input. The software is a bit intimidating but not to bad once you get used to it! Also at a price of 475....its cheap for what it does!!
Last for my piggyback tests....(I'm getting sleepy)
SMT7:
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Summary: You can say im biased...fine...but the list goes on and on for what this Standa-- i mean piggyback can do! Fuel & Timing of course, AFM learning which can be used to remove the AFM in place of a MAP sensor, boost control, extra injector(s) control, full compensation maps, dual map switching, AFR target maps, Wideband open loop control, up to 10 outputs with different "setpoint" options (for fans, pumps etc)....that is just a piece of what this unit can do! This is defiantly the closest to standalone you can go before going all the way. Once again the tuning screen is a bit confusing at first and takes a bit to get used to, lack of wiring diagrams and install guides (other then the S2S Tuning one and the install manual included in the package) may create a harder time installing the unit.
The price, while not really expensive, of 685 is still higher then the rest....esspecialy for those who wont even use all the features!
The TurboXS Unit:
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Well to me this is a pritty pointless unit...like the s-afc it only does fuel and can datalog.....act as a shift lite too? Wow...for 375 that is nothing i would consider useful at all. Heck the HKS Fuel Regulator unit is better then this as it costs 175 and does virtually the same thing.
I wouldnt really recommend it
EDIT:
I have to say that YES i am a reseller of the SMT line of products, and you may think that I am being biased on all this and you should (as said by others) take all this with a "grain of salt", please understand that this is all up for discussion. The reason WHY i went with perfect power and the SMT series piggybacks is because of the above reasons! Why would I go for something thats not as good yet costs more? I am also a greddy & HKS dealer as well yet i don't go boasting about there piggybacks, it just does not match up as well as the SMT units do. I'm not here looking for money, most people are but I'm not like that and some people can back me up on this. So take it the way you want it, but please if you have any input post it here! This way I and everyone can see and add their own input to the matter. I will change the above info accordingly if things change.
Thanks and I hope this has been helpful.