e91 Runflats or non runflats?

[GOG440]

I have an E91 325d Msport
I need some new tyres as when I changed to winters I realised my rear tyres were more shagged than I thought.
I also need 1 new front so I am considering ditching the runflats and putting 4 new (decent brand) normal tyres.
The pretty much 50% saving per tyre is tempting and I have heard that it will improve the ride.
Has anyone any experience of going down down this route? I do roughly 20k a year of mostly M-way driving of that makes any difference (I already have a can of goo for emergencies)

[GOG440]

Thanks
This is my first BMW and first experience of runflats so it is a bit of a learning curve.

[GOG440]

4 new non runflat tyres ordered from black circles to be fitted on my next day off on thursday.
I did struggle to find the same that werent as expensive as the runflats so I have gone for the kumho ku39, seems to have good reviews.