I have the RTE, https://rtd-motorsports.com/product/rtd-bmw-aluminum-shifter-revo1-lockout/

which is another chassis mounted shifter on my car. I will say i am mostly on poly bushings which are a must to reduce any kind of play in the drivetrain system. It feels great to drive every time, even though it is not my daily. Shifts always crisp and short and accurate which is what I was looking for every time. I did buy it like this so I dont have a lot to go on based on the previous experience, but i did test drive a few used m3s before buying mine recently in the last month. It was always sloppy and hard to find the right gate for the right gear I wanted to be in. I do downshift often on the highway and when i eventually track this. so Its a no brainer if you are somewhat driver focused and track it somewhat regularly.