Well, there are only four EPRs in the world. It is too early to say. Frankly, as a non-expert "armchair observer", Finland was dumb for starting the EPR project before the design was finalised.
I think the problem of the Finns was that they really wanted energy independence and tge inly ones that were on the market were the french. No doubt the frenched used much diplomatic muscle to attract them as a first experiment.