Most of the folks here that have Toyo Open Country MT's think that they're great. Just be aware that the one's you are likely to purchase for your JK are load rating E, and are slightly heavier than Rosie O'Donnell. That means that you need to run them around 25 psi on the road to avoid having your kidneys bleed, and both your acceleration and braking will suffer.
On the plus side, the last two Toyos that I bought balanced without any weight. Toyo's quality control is very good, and the MT's work as well as or better than any radial mud tire that I know of. They are also very tough.