I have rebuilt my shift motor twice in 300K miles on the BII, it works perfect every time I push the button.
When it did stop working the one time I was on a 4x4 trip. took me 4 minutes to remove it, throw it in the back of the truck, and shift the truck into 4x4 low vice vice grips and wheel the rest of the trip, then another 8 seconds with vice grips to put it back into 2hi for the drive home.
my 88 BII has the "touch drive" push button 4x4, the hi range and low range buttons are in an overhead console thing. I could have converted to a manual t case about 8 times by now (had the chance to get a manual 1354 alot) and passed it up. I figure when I have 4 shift motors sitting in storage (long story, I have t cases, axles, engines, etc)and I can re-build /clean one so it works like new in about an hour... why spend the $$$$< cut the holes, run/find the linkage, etc?
I love my push button 4x4, but I like to be different
I coverted my 96 explorer 5.0L to a manual 4406 transfer case, complete with linkage, shifter, and a geo tracker boot. I love that thing, in fact I drove it to work this AM, in the snow, and I used 4hi almost the whole way (icy) just reach down, pull the lever back and shift into hi...works *****en and feels solid.
The only thing that typically goes wrong with the e shift t case is the shift motor, there is a bushing in there that falls apart and the motor brushes get dirty. It is simple to rebuild the apature and clean the motor and brushes IMO, alot easier then installing a manual t case.
I say its up to you
If you have the chance to grab one at the junk yard or somewhere and it comes with EVERYTHING you need for a good price (under $300 to me is fair) then its worth considering. If your push bittom 4x4 works great, then spend the $$$ on something else
my 02
300K miles, 4x4 push button has only not worked on my 88 one time, there are 3-4 trucks driving around with shift motors I rebuilt, as far as I know they all work perfectly......still today
my son in law has a 97 XLT 4.0L auto with the crappy AWD t case, the t case is history..... over x mas break we are converting that truck to use a 1354 E shift t case

so no more AWD, but still 2wd, 4hi, 4low NO AWD, that should be am imteresting conversion

1354 e shift t case complete with motor and low miles = $100 on craigslist