Welcome to the Super-T forum! While many of us here have owned Chucks, you'll get the most response to your question in the Chuck forum.
While you're here; why don't you get comfortable and take a look around. The Precise series units are very cool PVs.
Before buying your Chuck, I'd suggest finding something in your home that has a sprung button as small as that of the Chuck. That you then press it for a few seconds, a couple hundred times in a day. I suggest this because when I had mine, pressing it for each hit during the day would make my "trigger finger" sore the next morning. At least for me, the large bottom trigger on the Super-T PV is much more intuitive and comfortable to use.