I have no experience of Scottoiler so I can't compare, but my Loobman is excellent. Just remember to use it (it's easier than you would think to forget until your'e well into that wet ride). XT600E chain and sprockets still very good at 10,000 miles on Loobman, all weather riding. The only thing you have to maintain is the two fingers which touch the sprocket - but these are just cut down cable ties and therefore cheap. When you get the package it looks very complicated - don't panic, it all comes together.
Go for it and find a use for those left over bits of gear and engine oil.