First I ever heard of it was by your post here. I am surprised because I am typically up on new tech and it seems this one slipped under the radar for me, so thanks for bringing this to my attention.
Apparently it was a successfully funded Indiegogo campaign.
Lack of discussion here on UU is likely due to both the obscurity of this unit, as well as it being a bit tough to find any vendors with it actually in stock.
Methinks this device would cater more to those getting paid to perform, who can justify the budget as part of the gear that makes that income possible.
I believe the iSolo and Koaloha booths were just coincidentally next to each other at NAMM. But the stick-on pick-up was so cool that the Koaloha guys were impressed. Here's more Ryo and a shot of the iPad that the pick-up was connected to. The guy at iSolo said it would be "much more" than $350. But it sure was cool!
"Yes iSolo is working on ukulele.This version is for many instruments.
And a new product which is especially for ukulele is going to launch around April. "
They said the violin version is the one shown on the video at the NAAM show. It obviously works but they suggest waiting for the ukulele specific version.