Still they are all well designed locks.
I recommend the smartkey v3 for people that need a lot of locks they can source quickly on a budget. The sidebar design is a real pain to defeat and if the lock is in a body with tight tolerances you may not be able to shim the sidebar at all. Without some kind of attack to tension the sidebar they can't be directly picked.
For those with more money to burn the Medecos are good security for dollar.
I put a couple Protecs on my luggage as tamper evidence devices so the TSA has to call me when they need to search it.
I would not bother with Protecs on a home as they are very expensive and there are generally better areas you can invest in home security for that kind of money but if you have a small number of ingress doors they are nice.
I don't think anything is unpickable/unbackable but when the time to defeat a particular lock someone has not seen before takes 10 minutes to hours and few if any in the world can do it I classify it as a "good" lock when the status quo can be defeated in seconds.
Does the TSA no longer open those locks with a grinder/bolt cutter?
I have never once had a lock cut. Only one flight ever did they call me for access but normally they don't bother.
YMMV.
Protec2: Very very difficult to pick, however there are videos of a few picking it: https://www.youtube.com/watch?v=6zVSJ_wauwg (https://www.reddit.com/r/lockpicking/comments/edrrjo/hardest...) https://www.youtube.com/watch?v=AsG90UGRTpw (https://www.reddit.com/r/lockpicking/comments/mie59t/abloy_p...) https://www.youtube.com/watch?v=6UZ6tcvgd9U
The Protec2 I would trust far more than the Kwikset SmartKey V3, since it appears only several of the best of the locksport community have been able to pick it.
I couldn't find record of anyone opening a Cliq. I'd be hesitant to say that's because they are unpickable, though. I believe quite a number of the locksport community would not be very interested in attempting to open a Cliq as it isn't purely mechanical.