I've got 20 plugs for making pedalboard patch cables. Have used them in conjunction with a Sommer Tricone MkII cable - this pair fits together pretty well.
I'm not very good at soldering, but these plugs were the easiest to deal with in my experience. Both tip and sleeve have individual plates for soldering - they haven't required any additional cleaning, so tin was applied pretty easily.
These pancakes fully reveal their "compact" potential being used in a single row of tightly-spaced pedals with side-mounted inputs. But with pedals, that have a close-placed inputs-outputs, the width of pancake most likely will lead to a problems.
The quality of the ring part makes me doubt in its sturdiness - seems like it made out of ceramic or epoxy resin material, that tends to crumble when exposed. It has tiny pores in it, that don't adds a confidence in a reliability of the whole plug. On the other hand, it could provide more heat-resistance, comparing with a regular plastic rings - but I've never faced such a problem.
Furthermore, the overall quality of the plugs differs from each other - it concerns the straight of the sleeve and tip, particularly. One of the plugs has so much scewed tip, that I just can't insert it in the pedal's socket, another one had so tight motion, that I was afraid of brokening of a pedal's jack input. So I had to refuse the idea of using both of them. The rest of these plugs have similar problem, but in a minor degree, so it doesn't prevent from using them.
All in all, I would recommend these plugs only for using in a tight-spaced pedalboards. But if you have the opportunity - look at something more sturdy and consistent.