I have the SimS pick up system in one of my @Andyjr1515 builds - very impressive. I believe he's using them on his current project.
Nick Smith ( @doctor_of_the_bass) was their public face up till January of this year. He brought a couple of their basses to The Herts Bass Bash a few years ago. I think he had a few at his shop/studio in Peterborough. There are several demo videos on YT.
Quality is up there with the best of them - top quality hardware and amazing build quality - I haven't heard a bad word about them. They're in the £4K price range and on at least a par with the competition. If I had the cash I'd give them serious consideration.