My wife loves the heated seats and it is something we have used often during this cold snap. Heated water jets are brilliant on the golf. As a comparison, our other car is a SAAB and the other week we had both cars out. The Golf you could practically use the jets right away, on the SAAB it took ages. (With the correct concentration of fluid). It was -10 at the time.
Once again it is a personal choice, but it something we are glad we ordered.