As stated it depends...
and just like 4 wheel drive,
better to have it and not need it, then to need it and not have it
If you have a short bed,
if you have a 'long ' pinbox like a trailair triglide,
if you like your pickup rear window
I opted for a superglide auto slider (
like this one) so I didn't have to remember to get out and unlock when I was worried about 20 other things pulling into a tight spot...
or having to make a u turn when we got lost on that two lane road !!!