Any views to how effective these are for cafe stops or any better alternatives?
Next to useless but marginally better than nothing. A small pair of cable cutters would have this off in a second. My bike got stolen locked up on a busy cathedral forecourt within about 20 minutes in the middle of a weekday. It had a cable that was much more substantial than this one. Small bolt croppers hidden and used in a plastic bag had it away easily, in about 5 seconds. The armoured cable locks are no better, the cable inside the flimsy 'armour' is only a little thicker than the lock you asked about. Best policy is to always take your front wheel inside with you and leave your bike at the back of the pile of more expensive bikes!
These types of locks look promising for that sort of use, but expensive
LITELOK Gold Original Bike Lock (Boa Green) https://www.amazon.co.uk/dp/B0792G863T/ ... tCbKVW16KR
Despite what they say they aren't too difficult to saw through with a good quality hacksaw blade, and can be twisted off, but are still more secure than other locks of that weight I guess, will take longer to break and be a little more of a conspicuous theft.