I've been with Supanet for about two and a half years.
It's been "not bad" in that time, but I had low expectations since we're "out in the Styx", so the speed (around 1Mb) was more than I expected.
When things have gone wrong they have been entirely clueless and mostly unhelpful, occasionally not for lack of trying but mostly not.
Recently I've been having routing problems that result in me not being able to access some websites (msn.com for example), these appear to orginate with Supanet. One email to support ten days ago magically (coincidentally?) fixed the problem, though I received no reply. The same problem has now recurred, no reply to my email but no fix either now.
It seems to me if you don't want much out of an ISP then Supanet might be ok, more than that and it's a clear case of "cheapest is not necessarily best".
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