Here's another 2.51 review from a manual guy.
Two weeks ago I switched from Unitronic Stage 1 91, which gave me 20k perfect, OEM+ miles to EQT Stage 1 91 2.5, and I was blown away by the power/torque increase. It felt like going Stage 1 for the first time again. Yet the drivability wasn't as refined as Unitronic, the car FELT tuned, boost came on/off like a toggle switch. The valve lift switchover point at ~3k was extremely noticeable and oil temps were higher than I ever saw with Unitronic, even in 105F CA summers. That being said, the power was amazing and drivability was still very good, just not on par with Unitronic.
Enter 2.51. Holy shit. I'm not that familiar with software version naming conventions, but surely this is 3.0???
All the minor issues of refinement are gone, drivability is now as good as the Unitronic tune except with gobs more power and torque, which are delivered more smoothly. The valve switchover is seamless and oil temps are sitting perfectly around 100C/212F. I'm blown away.
I made the switch because it seemed like Unitronic's product, which was arguably fine in 2018, is essentially obsolete now. I thought with 2.5 that a conservative, OEM+ kind of driver may still want Unitronic, but no longer. This is an exceptionally high-quality, fun tune, and those old tunes developed by companies who've since abandoned the platform are a waste of money in 2021.