My opinion is that unless you are a professional tuner and knows what you are doing, I wouldn't advise you to D.I.Y when it comes to tweaking the ECU.Greytezza, i remember that adian did mention about emanage ultimate that better compared to his Vpro in term of user friendly.....and for EManage ultimate our ecu will not reset it back as the blue emanage, thanks to it ablility to loop the o2 sensor.......your opinion.
Yes..tuning of the HKS VPro ECU can only be done by a handful of authorized tuners but the functions and options available on the V Pro would outweigh the setback. The V Pro is proven but it is really expensive but will be a good initial investment if you are into serious power modding.
I have been using the PowerFC since I started seeking for more torque and HP for my car and it have not fail me yet. I would have gone with the V-Pro but my budget did not allowed me.
I know that the blue emanage is not suitable for our car, but as far as the Ultimate I have not heard of anything good or bad about it just that the price does not justify the functions and options it provides.You will need to talk to a tuner for more advise on that as I do not know much about it.
The PowerFc would also allow you to "shut out" the O2 sensor which I am doing on my car and I can also switch it back on again for recalibration of my idling with the handheld power commander.
I would suggest you to compare all the available functions the ecu offers against the price and then make your own judgement. At the end of the day, it will be the final decision and preference of the buyer to choose what he feel comfortable with....and the end results he is seeking IMHO.