the 29's are enormous. go to a truckstop and look at one. i had a cobra 19 in my TJ - i saved it when i sold it. i couldnt even find a place to mount that in the 11+ JK dash configuration. so i went with the 75.
from everything i can tell the 75 works perfect. the speaker isnt the loudest and sometimes its hard to understand people, but if thats a real issue you can upgrade to an external speaker. i have flipping awesome SWR meter numbers on this one, my range is about 3 1/2 miles on the interstate, about 1 mile in dense forrest.