It's great that you get his policy by email. Saves time and money, simply print if you want to play it safe.
But what I recommend everyone necessarily, the fact is that you should read them carefully. So I am a little disappointed by the product description. Here was nowhere to be read that the guarantee will depend on the value. In three years so the first after the normal warranty, the sum of the guarantee is a maximum of only 80% of the purchase price, in the 4th year 60% and in the 5th year only 40%.
It is now entirely up to you whether he really wants to insure it or not. But when I assure my car full insurance, I pay a lot of money and also get my services.