I can highly recommend the touch plates from Charlie at Triquetra CNC. It has made zeroing my machine easy and repeatable. I don't have a lot of upgrades to my machine, but my workflow is simple, easy, and I get consistent results. The upgrades I have and love are Charlie's touch plate, a SuckIt dust boot, Estlcam CAM and machine control (supports the touch plate), and a mini pc attached to the X-Carve to make it standalone. I have Charlie's Y-Axis risers too, but haven't installed them yet because of workload in the shop, but I'm looking forward to it! If you buy Charlie's touch plate (and you really should) make sure you get the magnetic wire attachment clamp (just a few bucks) and a copy of his Triquetra Toolbox software (which I believe comes free with the touch plate). I didn't think I would need the Triquetra Toolbox software, but there are a lot of cool things in there that make life much easier. Especially the machine calibration stuff! Plus Charlie is full of knowledge and is more than willing to help out if and when you run into a snag. His customer service is outstanding!