Yeah, that is tough one and ultimately the decision is up to you. Before I ordered my car, I did a ton of research (including this forum) on not only the car but Sync/MFT. I knew of all of the problems/complaints and still went with it for a couple of reasons. I do not have my car yet so I can't speak for true experience but some of the reasons for my decision were based on a variety of factors, a couple being:
-- being that it is computer-based problems can be fixed via firmware/software updates.
-- I plan on having the car longer than I would a typical smartphone or computer. I did not want to make a rash decision now based on negative feedback to find out in year people are loving this system and it is too late for me to go back. Computer or phone problems it is easy enough for me to say "I'll just get another one." This is a much bigger investment than either of those and again, didn't want to deprive myself of the system's potential just based on what I hear today.
As Ford is putting so much behind the system as a differentiating factor in their cars, I can't see them backing off and just leaving people hanging. It is a big marketing push for them so in my opinion they will continue to update to improve stability and the like.
Look through some other threads. People that have had the most recent update seem to be reporting better performance already. Of course, it is a very recent update so more time is probably needed to really get a feel for it's effectiveness.
A lot of times on forums such as this one, people get on to vent their frustrations/air their complaints. May not be a true cross-section of the entire Sync/MFT-owning population. I'm not saying these frustrations/complaints aren't valid just that there might be a lot of people out there that have everything working fine and you don't know about it because you haven't heard from them. As completely_focused said above, sometimes the problems are incompetent dealership service centers and not necessarily the system itself.
Someone like Rusty obviously has a legitimate complaint (actually, way beyond legitimate at this point, he should be out for blood). He deserves satisfaction from his dealership, or Ford, or both.
I've always bought lot cars and this is the first one I actually ordered. I decided before ordering that since I am ordering and playing the waiting game, I am going to get exactly what I want exactly how I want it. I took emotion out of the equation based on what I read here and elsewhere and gambled that the system would evolve and improve. Again, I plan on having the car for for a while so I didn't want to make a rash decision based on current info and then a year from now it may have been the wrong decision.
In the end it is up to you and all of this is just my opinion/logic. If it helps, great, glad to be of help. If not, ignore it. Either way, I would be interested to hear what decision you do eventually make so do post when you decide.