I saw that post, but there wasn't anything concrete. Just one guy saying comparable speeds, and another saying that they were ok. I was asking for more of a hands on, as in speed tests, and such. One or two "they're ok" posts could be a fluke or the company posting.
Since Clearband is a vary localized ISP, my guess is that you won't find much more confirmation than what you've seen already.
From a technical standpoint, Clearband has enough spectrum to deliver those 50 Mbps speeds all day and not run into problems. Now whether the technology translates into practice I can't say, because I'm nowhere near SoFla these days.