I have the BH92 and it's a great backhoe. Plenty of power to do the things I need around on my property including removing boulders, stumps, drainage ditches, etc. Based on the way it's built, I don't have too many concerns about it's longevity. Now it's also not a commercial regular sized BH either so one needs to know one's limits. Last year while waiting on the delayed delivery of my MX5100 with BH92, my dealer loaned me a mini-Ex for free for the weekend. It was a great machine, did a lot of work fast and yes it's much faster than the BH92 as you don't have to constantly get up and move the tractor. From that perspective a mini-Ex is great. However I am of the opinion and position that I can't just 'go rent a mini-Ex' as I don't have a large enough truck to pull one and they are pricey for the weekend. Also I don't like to have to wait and line-up my BH jobs, instead I like to do them as they come up and dictates owning a BH of some kind. There is nothing like having the tool to do the job right then and there instead of having to wait.
This likely doesn't answer your question directly but the BH92 is a very nice BH, well designed and strong.