Not knowing how much data you consume in a month, but some have had pretty good luck with them. -- The difference between genius and stupidity is that genius has its limits.
IDSL will be slightly faster then your previous ISDN. IDSL requires its own "Line", and combines the D channel for a total speed of 144/144, instead of 128/128 of ISDN. I used IDSL service from Qwest for two years. My brother and I could game/surf at the same time with no issue, however, downloading would saturate the line. If IDSL is available, I would go for it, its stable, and usually considered a business class service, so there service commitment will be more likened to your previous T1.
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