Excellent for the price. Great quality, you can't go too far wrong with these!
These are great quality, seem very durable and do what they're supposed to. I use about 10 of these cables (although half are the shorter 1m ones, but same quality) on my setup and have never had any problem. Some are direct from MIDI controller to instruments, others are used on MIDI Thru boxes and/or with MIDI extension cables, and all work perfectly.
I had strange issues with cheap MIDI cables I bought elsewhere online (big mistake obviously!), that I'd never have thought could be down to the cable but as soon as I swapped them out for Thomann's ones, I've not had a single issue.
I would highly recommend these. Such good value!