Hi Andy, glad to hear that you're easing your way back into things.

I bought Jam Origin (2 i think?) about a year ago and, one minor hiccup aside, it's been working well for me on my limited usage. I kept meaning to write a review but...
Anyway, moving on...
Pros:
Once set up it pretty much does what it says. You play the guitar, it converts it to midi. There's a nice little display that show's what notes are registering, the gate is simple but pretty effective and the onboard piano sounds are good enough to let you know how your part is going to sound.
I've also used it in a couple of places where I've wanted to take a pre-existing guitar part an add another part. Simply done by sending the audio to a new track with Jam origin and then feeding the midi to another instrument track.
If things are a bit messy (my guitar skills aren't great) then you can just record the midi part and then go and tidy it up in the midi editor.
Cons:
I seem to recall the registration process not being quite as smooth as it should have been (not terrible but a bit of back and forth between plug-in and registration screens).
There's a dial on the interface that should allow you to blend between the incoming guitar part the key part, with guitar only at one end and keys only at the other. This has stopped working for me and now only plays the key part. I should probably reinstall but frankly it's never been a problem so...
It doesn't do bass. I know they do a bass version but I had hoped I might get a little bit of mileage out of it. No dice, mind you, I was taking the signal from a mic'd up double-bass; a straight electric bass DI might get better results.
Couple of examples here:
In the break, the organ part on the RH side is a feed from the guitar part on the left, with a little bit of midi tweaking afterwards to increase the sustain and add a couple of additional chord notes:
https://soundcloud.com/blinddrew/a-prologue-20181028
Similarly the piano part of the break here is a feed from the guitar part, no tweaking on this one though:
https://soundcloud.com/blinddrew/wild-d ... t-20180318 I don't think this is the built in piano sound but I'd need to check the Reaper file to confirm.