The problem only occurred with the stepped Maxle (see image below). So long as you don’t have this the ProII axle is fine.
Not at all, both that I snapped were with full thickness axles (in a Last Herb and a Dare), pretty commonplace. Hope did replace them quickly, mind, and got bonus comedy points for sending me 2 replacements for “the next time it happens”. Sometimes “no questions asked” really just means “no need to ask, we know our product’s substandard”.
So, I converted to Evo, which is bang on. Not cheap to do but well worth it. This also means I have a couple of spare pro 2 135×12 axles if you’d like to go down the multiple redundancy route 😉
(might be easier and cheaper to find a used Evo hub or wheel and swap parts, then sell on the old bits as a complete hub?)