PCR is a very useful technique. Not the first I’d bring in-house, but certainly on the list.
How exactly are you applying it to learn more about your cannabis?
are you using marker assisted selection? DNA based sexing?
Edit: as cute as that kit is, I wouldn’t bother with it even for DNA based sexing. I’d get a real machine used. A PTC-100 can be had for less than $400. I do like the LED based transilluminator. definitely beats EthBr & UV.