I just ordered four more spools of the stuff this morning (two fine, two heavy, both black) from the fine folks at Berkshire Junction. They're so nice (and trusting) about the ordering of their EZ Line. They send me the ordered items along with an invoice from which I pay them by check.
I've used EZ Line in the one aircraft I've built in the last few years (Accurate Miniatures Grumman F3F-1) and the last three 1/350 ships I've done (Dragon's USS Buchanan - as the Duncan, Trumpeter's 1915 HMS Dreadnought, and Revell's SMS Emden). It's great stuff!
Mike
P.S. I should add that I've never used the flexible line from Hobby Lobby to which the OP refers so I can't compare it. Mike