I like them. We ate the last, enormous Mira for Valentine's day, roasted. It did the two of us! I find they keep very well and are quite slug-resistant in my chalk-flint very free-draining soil.
For most spuds I prefer waxy but these floury ones do roast exceptionally well.
I think last year, however, was a very funny one for spuds, as it was so dry, even the waxy ones were falling in the pan. Try again: if we get a very blighty damp summer then you'll probably get totally different results.
moonbells (growing 12 of them this year, after last year's eight)