The CTS has a VERY low sampling frequency compared to even the low budget data logging systems racepack offers. It (the CTS) also lags more than one would wish.
That said, the CTS is a valid system if you only want minimal external inputs aside from your OBDII readings.
Check out MOTEC
They all use 0-5v transducers, so don't waste your money on name brand sensors unless you have money to spend on the "insurance" of top dollar parts.
Also, none of these systems offer anything you can't do with Arduino micro controllers, though they all do it with MUCH less effort.