I've tried a few of these, including the Sinsonido and the Traveler.
If you have air travel in mind, then IME they're not so great. The Sinsonido for example is just over 36" long; yes, it can be packed down (complete with the plug-in 'wings') into a space not much larger than a cricket bat, but it still won't fit in a suitcase, won't fit in an overhead locker, and falls foul of the hand baggage rules on most airlines.
These basses were designed before the huge uplift in security that we're now used to, and are probably more trouble than they're worth.
If you're driving or travelling by train, then in truth you may as well take a normal bass. If you also take something like a PJB Bighead, then you're sorted for most holiday situations.