I think too much is made about the size of the Jack Bass. Neither Jack, himself, nor I are very big, and I have no problem with its size. Neither does Jack.
I've played one for 18 years, and have yet to find a better instrument at any price. They are versatile, very responsive to hand placement and string type. The Varitone switch is easy to use, if you want to switch sonic gears. McCartney's bass player and Ringo's bass player uses them - hmmm. Many professionals use them. They are a bargain priced professional grade instrument.
I got 2 sets of Rotosound 55's compressed round wounds for Christmas. What a treat on the Jack bass! I feel so spoiled.