nopy is really a great experience. No lag, no bandwidth restriction, no paywall.
Personally I wouldn't mind ads as long as they don't eat up the whole space/destroy the browsing experience with pop-ups or redirects.
When I download from a download manager I see resume supported, but not while resuming from my browser (Palemoon). May be just my browser though. There are no failed downloads if I don't pause them in the browser, and there's no bandwidth fluctuation ever.
This is very well maintained. Hope you get enough supporters to open the site for public uploads (I will stop torrenting stuff and download preferentially from nopy then).