Highly recommended.
Had driven a rented 2SS approx. 250 miles without one, and now have driven with one installed (in my own car), now for the past 15K miles. I almost never take it out, but when I do, I can tell that it's missing from the moment the speed gets past 35 or so.
Had an excellent buying experience here:
https://www.shopchevyparts.com/exter...-92288309.html
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'16 2SS Garnet Red ~24K
"Mods": GM wind deflector, home-made rear seat delete & platform, not-quite garnet red key fob cover (+10rwhp)
'99 4Runner 367K
'94 ST1100 146K