Buying speakers unheard is always a dicey proposition. I only consider used speakers which I have not heard if the seller is local and I have a chance to audition. Sure, you could always resell them if they do not work, but buying and selling speakers just for in home auditions is too much work for me. I'll do it with cables, preamps, even amps, but if I'm buying 200 pounds worth of speakers, I want to hear them first.
Of course, as usual, YMMV.
Of course, as usual, YMMV.