clear, new fast DSL service provider, is it any good?

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New competition on Fast DSL market is fuirous with non - stop marketing and advertising from these providers I knew of from local. ComCast, AT&T, and clear. Not mention the Mobile phone internet providers too. Recerntly, I saw some advertising paper from clear, a brand new company, and they provide a promotional price for both home and mobile DSL package around $55 for the first 6 months. I was curious, are they any good in compared to AT&T. I always thought that AT&T is most expensive one I stick with. But I also need to know the quality of the product too. Does anyone can give me their insight on this one?