I would post the TalkingBass review here too, but he goes on and on repeating the tired cliches about short-scale basses being for people "with small hands" or "children", so I won't subject you to that. There's also the cliches about sound difference which are think are negated in our age of digital processing.
I bought one of these for my 3 month old son as I thought it would be the right size for his little hands. It's great that Sire makes a toddler-sized bass.
Ah, just kidding of course. The U5 is not a "child's" or "starter" or "small-hand" bass. Bear in mind Stanley Clarke, who has hugely large hands, plays a 30" bass often. I'm not showing my age, am I, bringing up Stanley Clarke? I can say that a SS bass like the U5 is great for "injured hands" - finger injuries, tendonitis, arthritis, etc. One reason I bought a U5 was I had injured my left index finger pretty badly. It's mostly healed but the U5 can take some of the strain away if I find I am experiencing any discomfort, which is less and less frequent. I still play the U5 often anyway, it's just fun to play. With my average sized hands, there are more soloing and chording options on the U5 SS.