I flew Oman Air early last year for the first time, and had a great experience on them. They’re one of my favorite airlines, largely thanks to how “exotic” they feel. Unlike some other Gulf carriers, they do a great job integrating Omani culture into the experience.
At the moment Oman Air has a couple of longhaul business class products. They were originally known for their incredible business class hard product, which was about the best out there when it was first introduced. Select A330s still have this product, which is in a 1-2-1 configuration.
Meanwhile their 787s and select A330s have Apex Suites in business class. Initially I thought this would represent a downgrade in terms of the quality of product, but in reality I think these seats are superior to the old ones, at least if you manage to snag one of the window seats.