I too am still running FW4.5 on my 60. For me stability is king. I have 13,500 miles on the car now and have yet to even have to reboot any of the screens. I also want the lowering suspension because every mile counts when I go on some of my long road trips. I may eventually upgrade when I feel that the user base out there comes to the conclusion that there is a truly superior Firmware version out there. From what I have read about FW5.8, it's not it. I would like 105KW supercharging (currently limited to 70KW on FW4.5), so this is the most compelling reason to update. I think by spring time I might upgrade. I would like to make a pilgrimage to the Tesla factory in California when the coast to coast supercharger network is up and running. Having the fastest charging possible when going across country is a good thing.