One of the shops I frequent... recommended I piggyback JB4 over tuning the car. He had really good things to say about Terry and he told me that he has seen excellent results with the JB4 on track with many different platforms and in many cases they have been outperforming ecu tunes which seem to be more prone to problems.
Now, that is his personal experience but he is a manager at a fairly well-known motorsports shop with many locations across my state.
My personal feelings are that when it comes to piggyback tunes.. I would 100% go JB4 .. I wouldn't even consider any others... I will still stick to my guns and say that if you plan on using the higher maps.. it would probably be a good idea to take a look at some of the weak points across the powertrain/drivetrain and maybe shore some things up a bit for safety, longevity, peace of mind, etc.
I am very interested in seeing what VF Tuner comes out with.. the company is obviously 100% legit ... just browse their website and reviews .. I mean... its all there.. and these things do take time...
WHICH BTW.. (I'm not turning this into a JUBU thread so don't even start...)
You know... you gotta give JUBU some credit guys.. just saying... a few blown engines aside.. they have successfully tuned quite a few Emiras by now with Stage 1, 2, and beyond... it's been over a year. That's a pretty lengthy gap as far as mainstream providers.