I bought two of the flow control QD's and didn't really like them. They didn't seem to do much in controlling the flow, and getting them dialed in was a pain. I've used flow control Perlicks for at least 5 or 6 years and liked them, but I started having some issues with incomplete shut-offs and slow dripping over time. If I was gone for a week or more I'd return to a beery mess with fruit flies buzzing the taps. I rebuilt the taps (all six of them) and restored them to factory-new performance.
However, in the process of rebuilding them one at a time, I picked up a Nukatap non-FC as a temporary fill-in. I absolutely love the 'Nuke. It does everything the advertising hype claims. When it came time to upgrade the Jockey box tap I replaced it with a Nukatap and it works great. Don't need the adjustable Perlicks. What remains to be seen is how well they hold up over time. So far, great flow and no excess foam, even at the beach.
AND: I
really like having the return springs on the faucet to prevent accidental emptying of the keg, which as
@bailey mountain brewer pointed out, is not available with flow control faucets. It's like one of those things you never really thought you'd need or like to have. Until you have it and now don't want to NOT have it. But if you're set on FC faucets, Intertap was supposedly coming out with a flow control Nukatap. I haven't heard anything about it in a while, so it's unclear if the delay is due to supply chain shortages or whether there's some ongoing copyright issues rumored to be plaguing several tap producers who are suing and countersuing each other.