The thing about the OHMs is over teh years I have run them indoor and out, off many amps of all sizes, and they are never the bottleneck. They can take whatever you throw at them, at most any level. Most amps will clip before the OHMs reach their limit. Plus, I have never had an amp manage to damage one at any volume, indoors or out. I'm sure they are not indestructable, but for all practical purposes, they may be the most so of anything out there. Plus all moving and delicate parts are enclosed and never exposed where nasty things can happen by accident. I would never let small children near my Dynaudios but there is little they could do to the OHM Walshs save perhaps knock them over or maybe tear the grill cloth if they really tried.
Also I would agree with Polarin's comments.
If you want to listen critically from anywhere in the room and not just a small sweet spot, then the choice is automatic. That's a big one for me personally. But the sweet spot done well is pretty darn good as well.
Currently I have a 60 w/ch Bel Canto c5i Integrated Amp driving my smaller OHM 100s3s in my family room and teh bigger OHMs and the Dynaudios in more dedicated listening rooms downstairs.
The c5i/OHM combo can't match the other running off 500w/ch ref1000m amps in terms of going loud and delivering the goods with large scale recordings at realistic volumes, but otherwise still goes plenty loud for most things and the combo is still one of the best I have assembled over the years up to its limits.
The ref1000m/OHM F5 S3 combo is still the best I have assembled overall ever by far and I feel that one can be compared fairly with any of the big boys I have heard in various places over the years.
The ref1000ms with the smaller Dynaudio Contour 1.3 mkII speakers in a much smaller room is absolute top notch as well with some minor limitations though in that it cannot be considered quite as full range as many. I run the smaller OHM 100S3 in taht room in place of the Dyns sometimes and with those, there is nothing more practically to want in there (my 12X12 office/listening room).