This I agree with and mentioned it in another post also.Look, I know it's not ideal, but if your internet connection is mission-critical, you CANNOT rely on just one provider. Sentech is fine for home use, but if it's really really important, you better make sure you have another plan, just in case.
If you run a business you need a backup plan.
My wife runs a business from home and she needs 24/7 internet and has ADSL512 and I have MyWireless256.
The number of times one of them has gone down is unbelievable.
All you need is ADSL192 and MyWi128 and you are home and dry.
ADSL has its problems, many of them, and you only notice them when you have an alternate.
There are many sites that show "This page cannot be displayed" on ADSL, yet if I switch over to MyWi they come in fast and furious.
I have also had this happen the other way around but most the time its ADSL that fails me with this problem.
MyWi sucks when using FTP clients for some reason and here I use ADSL quite extensively.
Even on my own Website (LA) when I use CuteFtp with MyWi, it logs on but refuses point blank to list a folder if it has more than around 20 files in it.
I switch to ADSL and it rockets in no problem.
But on the whole, I'd say they both have about equal problems and never again will I only rely on one connection.