I had an Exclusive SR, recently changed to the Trophy. I agree with slmorgan42 about the pros and cons. The facelift is a bigger improvement from the SR, because of the larger battery and MG Pilot. Whilst the extra range feels nice, it hasn't in reality made much difference. The SR went farther on a long trip than I can, and I did over 48,000 miles in it all over the UK and France. As for efficiency, I have noticed no real difference despite the wheels. I fitted LED headlight bulbs and it passed its MOT fine, mainly because the beam pattern was well controlled. It certainly improves the lighting; oddly enough, the headlights on the Trophy seem virtually the same.
Only you can determine whether the Tesla update is worth it. I never worried about its lack on the SR. Since having it done on the the Trophy, I used it for a trip to Wales, there and back. No real difference or indeed, advantage save for the cost.