Coming from MX5s the tramlining on the Zed was initially a bit "disturbing" for me. The Sport Black 2 litre I had before the Zed was the worst handlng MX5 of all three I've owned, one reason I got shot of it. But, compared to all of them, especially the previous 1.8 Miyako and the one before that which was a lovely Mk1 1.8, the Zed felt awful when i first got behind the wheel. The intention was to get rid of the R/Fs as soon as I could but I've now driven it for getting on 6 months and think I must be getting used to it because a tyre change is no longer a priority.
Sure it still tramlines, but I get a feeling that new tyres aren't going to solve that. The steering itself is an oddity, I could never grow to love the electric power assistance, it's just an unecessary added complication which creates very little in the way of road feedback. Having said that, when you get used to it, the car can be hustled through the twisties at quite decent speeds and feel every bit as planted - if not better than - the MX5s. I find the Zed like my old Harley was - it takes time to get to know it, you can't jump in & assess it on the strength of one realtively short test drive - it needs to be learned. Those runflats are hard though, so maybe a change will come soon.