I just did the LTE upgrade today. Screen refresh is much faster, but of course nowhere near the speed of a good wifi connection. Map updates are quicker, but I never felt that the map speed was a issue with 3G. Surfing is MUCH faster, but I rarely used the car for surfing before, and probably won't now. When you do need a quick lookup, the increase in speed will come in handy. Cost was $500 plus tax, if you were to pay for it. If you apply the referral credit against the cost, there is no charge for General Excise Tax so referral credit utilized is a flat $500. Honestly, I probably would not have done it if I didn't have the referral credit.