I'm not familiar with Turf Teq, but I took a look at the base unit and the brush hog mower.
I believe you can get a lot more bang for the buck by going with a comparably specced Grillo unit.
The Turf Teq with mower lists for $5845. For an MSRP of $4950, you could buy a Grillo with same engine and same size 28 inch brush mower.
The Turf Teq is belt driven, the Grillo is direct drive.
Looking at the video showing how to attach the Turf Teq mower, the process to attach it is cumbersome at best. If you were to attach it and never take it off I suppose it would be okay. It took the installer 5 minutes to attach it (not counting for time edited out while he was cussing). I can attach my brush mower to my Grillo in 30 seconds or less.