I would go with an X4 for a 2013+ MY vehicle. In any case, you can sometimes find "used" devices by contacting Torrie at Unleashed Tuning. Unleashed is an official vendor on this forum.
info@unleashedtuning.com
You can also browse our ads section to see who is selling a tuning device, or put up a Wanted to Buy ad.
https://www.ecoboostperformanceforum.com/index.php/board,30.0.htmlAs far as the LMS tune goes, what are the official requirements to run the tune - fuel especially? Only top tier fuel is advised at all times. Not all top tier fuels behave the same, and brand performance can vary depending on which area you live in. You will need to scope out some local stations and compare results. If you have winter fuel in your area, that will impact performance on these "racehorse" tunes.
Re the violent shifts, that could be a combination of shift pressures, road surface temperatures, wheel/tire setup, etc. But the easiest "fix" is the shift pressure, just ask LMS to do that. Also, they recommend overfilling trans fluid a pint or so to prevent cavitation and it seems to work out pretty well.