The feel of these wonderful basses is more Greco than Gibson. The nut width is the same as the Greco, as well as where the neck meets the body. The pickups sound great. My Ibanez records really well. There's a slight compression that helps it cut through a mix, and the tone is pure bird but maybe not as blurry as some can get. The bridge is a two point, but it's the early 70's Gibson two point style (ever -tilt), and mine has plastic saddles. The tail piece takes care of anchoring the strings though, so there's no problem with any tilting. The bolt neck is the only thing that might cause these basses to get less respect than their Greco cousins, but if so, it's only in the eye of the beholder.
BTW, I've heard that there are set neck Ibanez Thunderbirds, and I saw an auction for one once (though it could have been a Greco with an Ibanez TRC), but I've never played nor seen one in person.