If you only want to spend US$22, I suppose that lock (the Yale) is worth that. But I agree with
@Senior_Cruiser it is not a lot of protection.
A cheap lock for a cheap bike is fine. Two cheap locks are twice as good, but figure that Yale's mere 14mm shackle is lightweight, AND its round so one cut will let it spin open, means you have only about 30 seconds of protection (15 seconds per lock if you are using two independent locks, one cut each), worst-case.
I have a Litelok X3 on the way. There is a 30-day wait time on them as they have a manufacturer's backlog, and my 30 days aren't up yet. That will extend protection to a few minutes BUT a battery powered angle grinder will not have the juice to do the job. You'd need multiple batteries and IIRC 4-5 cutoff wheels to get thru it (or a mains-powered grinder). For a bike in front of a busy shop that effectively makes it angle-grinder proof, not just resistant.
I don't bother with alarms. My locking strategy is to secure it to a solid object - which is required for my insurance to pay out - and to use two independent locks, so both have to be cut thru to enable moving the bike. Also each of the locks requires two cuts, so whatever time is taken getting thru my 18mm stainless shackle on my Xena u lock, or the 16mm shackle on my second independent U lock... guess what you get to do 2 more cuts. And I use a 2-meter Pragmasis boron steel chain noosed to the frame so you aren't going to be able to just release the front wheel or some similar shortcut.
The point being its obvious to the thief its easier to steal an adjacent car (or the next bike over in the rack) than my bike.
I see this question so many times, lets write up my daily outdoor locking strategy so I can just link to it from now on.
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