For me the fret less seemed a little pointless with a U Bass. The silicone strings mean that the frets don’t alter
the sound much at all, and slides/ bends are hard to manage with them anyway.
Also look at the Countryman bass ukes. Mine was £149 I think, and is fantastic. All ply construction
(which isn’t a problem on this type of instrument),nifty little preamp and Aguilar strings as standard.
Tried the U bass along side it, and honestly didn’t see the £200+ difference in quality or tone.