I'm currently running four ITElite PRO-SECTOR24015V_BOX units and I'm quite pleased with their performance. They have been operating since November. It is not rainy out here and has only drizzled twice since they were installed, so I can't speak to their waterproofing, but I can verify that high temperatures don't faze them. I also picked up one of their MRA24014s to try out as a CPE -- it's been installed only about three months right now, but it hasn't given me any problems (plus I finally realized how much more powerful and configurable a Routerboard-based CPE is than a commercial CPE, at only a tiny price premium).
I also took advantage of an unusually inexpensive deal on Jirous JA-214 units for use as CPEs, and was impressed at their construction, especially the screwless cover and the mount that you can position several ways on the case. However, the board mounts sideways, making the cable routing tougher and more stressful on the socket (especially with gel-filled burial cable), plus you have to hand-modify the case to pass a ground. The ITElite has a screw-in case and a mount with no tilt capabilities, but it puts the board jack in an accessible position, has a pass-through ground built in, and you can buy two of them for the price of one Jirous.
I ordered several more MRA24014s just a few days ago; they haven't come in yet. One of the reasons I ordered them was to publish a comparative review of the two boxes.
None of the units above are MIMO, I use only vertical polarity in 2.4GHz.