Acidic Reflux

I've been looking to get some more juice out of my CLS550 C218 and ECU tunes makes me nervous for pulling them in and out.
Yesterday I was referred to DTE Systems Chiptuning. Apparently its plug & play and not an ECU tune. No wire cutting. Easily reverseable. They are TUV Certified.
Anyone have any kind of experience with them?
For my car they are charging $1200+ installation which will give me around 60+ hp, 120+ torque.

TTMerc

I have a RaceChip Unit which is the same plug and play and is also adjustable power wise. I have had great success with it on my car. I have a 2014 CLS63 the chip has been on about 15k miles. I daily drive the car and a lot of it for work. Also tracked the car with great results. RAcechip is also very affordable compared to others

sentralfyr

Installed i DTE box combined with Pedalbox on a C180 and it works like a Charm
This is my second box from DTE
DTE

effectivetuning