Serious coffee (espresso) machines DO NOT need two boilers. There are LOTS of really great machines out there which are heat exchanger (HX) machines. A good HX machine has no problem pulling a great shot at the same time as steaming milk.
The machine you are looking at is a member of the class that is referred to as "Super Autos." You fill it with water, pour in beans, and it makes te espresso with the push of a button. I have never heard of one that can make an espresso as good as a talented barrista. These machines are quite complicated in that they grind, dose, tamp, brew the espresso, then clean themselves for each shot. Repair has the potential to be expensive as well.
before purchasing one of these I would highly suggest spending sometime with one and sampling the beverages they make. Everyones standards vary, but I can guarantee that I can make a better espresso than that machine. Additionally, making a cappuccino or latte at home using the "traditional" methods using a separate grinder and espresso machine is a bit messy and detail oriented and is not for everyone. it takes time to learn to do it well.
On the other hand, if you have been drinking the sort of drek that is often dispensed at coffee shops, tat machine may be sufficient for your needs.
In one sentence: "Super auto espresso machines transform the task of making a mediocre espresso-based beverage as easy as pushing a button."
With that machine, the problem may not be the quality of the servicing agent, but the amount of time the machine may end up spending with them.
If you really are set on a super auto, take a look at the Jura line.