MS is diy, while others are commercial product. If you're fond of doing yourself to venture into something new and build some knowledge from it, MS is the answer.
It's not only the tuning that you have to take into consideration when using MS unlike the commercial units but you are learning some fundemental electronics, understand how efi works, how the software works etc. so to make your MS a fun to learn base. The only problem that's usually bother most are the impatient feelings. Many tries to complete their project in no time and easily get frustrated even with a slightest glitch.
Whatever it is, if anyone of you ordered MS and have a shivvering hands to assemble those, then I can do it for you. I have all the necessary equipments and tools to assemble and fix your problems. Welcome.