I bought this to extend the functionality of a Lin6 HX Stomp so that I could access the tuner and mode select options whilst still having 3 FX stomps from the main unit and with the addition of a single TRS patch cable it does the job very nicely. The unit is sturdy and well built and should stand the test of time although if you're worried about kicking it around or it tipping over when might need to access it mid song, you might want to attach it firmly to a pedalboard. Not a problem for me since the functions I've assigned to it are more for convenience rather than things I need to access real time.
There's a dipswitch inside the case to select TS or TRS mode and functions can be assigned in a matter of moments by setting footswitch 4/5 from within the HX stomp menus. It's not a cheap option and it would have been nice to have an LED or at least a label higlighting the use of each button but it's compact, tough and does the job. The Stomp now does all I need and it saved me £100s and a lot of floor space as I don't even need to consider a full size Helix.