The traffic can be quite decent, IF you are a fetish performer who happens to speaks Italian, and you know your shit.
Of course there's a lot of time wasters and obnoxious jerks, but they have a list of time wasters (lista perditempo, ALL sites should have this), and you can run any Skype ID through this list, or add ID's to the list yourself.
I know that what I do is a niche, but I'm a non-nude fetish performer who speaks Italian, and I make a decent enough sum on this site.
As for the support, I can't really speak on that. I've been on mondo for about 3 years, I only had one dispute involving one of them jerks mentioned above, but in the end it was settled in a matter of hours in a civilized manner.
They don't have a software or a Skype plugin like
SkyPrivate does, so can't give them a rating on their software either.
The model interface looks and feels a little dated, but it does the job.
They support html, so you can insert your own pictures and whatnot into your bio.
Overall, my experiences are rather positive, but of course I can't speak from the average nude performer's perspective.