Rearranged my studio recently after getting a couple of new synths, so I needed longer midi cables. These are ideal.
I've used them successfully to send midi out & also to update sysex / send & receive. No problems. Totally reliable.
Apart from the different lengths available.. there are lots of colours to choose from, which is pretty useful.
I've bought a lot of these sssnake cables. The pro's are that they are brilliant for the money. I always through a few audio & midi cables into the basket of every purchase. Havent found any cons yet :D