I have installed a ultimate on my 33.
I have a 3" turbo back exhaust, hks front mount and nismo pump fitted, It was tuned by hyperdrive and produced 274rwhp which I was happy with.
Although unlike the pfc which is plug and play there is quite a lot of wiring to be done all injectors, ignition etc its quite a head f**k but take your time and its manageable.
The software is very good and fairly easy to work with, and the data logging is excellent, it can hold a fair amount of data internally with out the laptop connected depending on cycle time selected.
There are also a lot of extra options that can be purchased e.g. pressure sensor, link up to electronic gauges etc.
Considering the price it is very competitive, Ive been nothing but happy with it so far.