Best of luck with your decision. I went through this about four years ago. My first Roscoe was an SKB3006 fretless. I LOVED the sound, but so rarely got calls for fretless that I just didn't play it enough...and when I did, intonation was a huge issue.
A coupla' years ago I bought a 34" scale fretless, and was able to intuitively play it in tune with fairly good success. Reading charts was still an issue, as was muscle memory when I let too much time go in between practicing/gigging with it.
And then...just recently...another SKB3006 came into my life.

Basically, I've forced myself (forced...ha!) to play it, and to pick it up every day, if only for a few minutes. I've found that intonation is still an issue, but it's improving. And, I love the sound so much that I'm using it on gigs, even if only for one set.
Anyway, sorry for the tangent here. I just wanted to share my experience in case you might be in the same boat - essentially the sound of the Roscoe is so perfect for me that the extra work and commitment is worth it. Good luck...