We have been with Slingshot for some time now and have found them very good.
We have noticed that our internet has slwed down over the last couple of weeks to just above dial up speed (1 1/2 - 2mb file takes at least 2 hours to download)
Slingshot had a problem like this last year that effected us (can't remember what it was though).
Is the same thing happening or does anyone have any info on this?