Noise?
ie a noisy chain
To what extent would it bug you?
Not really definable on paper is it?

Like Yan mentioned a few posts ago, years ago I used a super thin chain lube, still have a bit of it, and had the same experience as Yan.
The noise of the chain bugged me after not a lot of riding, so basically had to apply it almost every day commuting.
Super clean mind you, so easy application and no excess to collect junk, but like a noisy hub or any other bike noise, I really didnt like the chain noise.

So my question to Cycco or STR, is this a factor ?
Maybe you aren't bothered by a chain sound that would bug me?