What didn't you like about the Waterfield Sleeve Case? Looks like a beautiful sleeve (I've ordered one myself). Does the ColcaSac work better for you somehow? (I'm genuinely interested)
Personal preference. I bought a ColacSac for my 17" when I first got it (probably a couple months later after purchase in early 2010) and had it sense. No issues with it, other than having some drink spill on it. Didn't get clsoe to my Mac but I ran it through the wash which may have resulting in some of that color getting inside. But either way for 5 years its held up nicely.
Its a very tight fit (which of course will adjust in time, but still hug the Mac just right). I used the pouch on the 17" sleeve (black) to hold my MX Master (cause I can't find a reliable case for it). Because the new sleeve it fresh it doesnt slide in as well, but its great for holding in my bag rather than just throwing it in there.
The Waterfield is a great product. It's sort of a more plastic feel, very durable. Its a little bigger, since its not an actual thin sleeve (like they carry). I had to adjust it a little to get it to fit in my bag, but then again its a tote so not entirely designed for laptop carrying. So, nothing negative about the product, its just that somehow the one I wanted found its way here and I don't need two.
I would advise again ordering from ColacSac, though. Unless you can contact and get a response to see if their customer service is still vacant. Also, they seem to just be using up their remaining material as their selection has dwindled from when I first ordered from them 5 years ago (surprised they were still up but figured I'
My pictures aren't professional, I just woke up so I half-assed them.