The bottom line is NOT TO BELIEVE any sales rep via phone or in the flesh anywhere in the world when they assure you there will be coverage. Get some one who knows and with the right gear to test things out first. Its not just Kanguru, I've had clients who have had similar experiences with Sapo etc etc.
Sales reps just sell...They do not have the details nor access to the technical data to know if a specific location has a good signal. There may even be a good signal outside one's property, but inside owing to thick walls there may be none.
I don't know how many times I talked and written and warned about this and PEOPLE STILL DON'T LISTEN. Whether its Internet Broadband over landlines or via 3G over the mobile network, GET SOMEONE WITH TECHNICAL KNOWLEDGE WHO KNOWS (NOT THE SALES REP OR SHOP) TO CHECK WHETHER YOU CAN RECEIVE A SIGNAL BEFORE PARTING WITH MONEY.