While I don't have the "Rocky Mountain" reel, I do have 4 Orvis "Battenkill" reels of various sizes (2 size 3-4; 1 size 5-6 and 1 size 8-9) and I've never had any problems with them. Orvis is a great company to deal should you have any questions or concerns with any of their equipment. I've thought about getting a large arbor reel but the more I think about it I can't come up with a reason that I actually need one (it's a want more than a need thing). Good luck!
Rocky Mountain reels are an excellent buy. My wife hasn't had any problems with hers. I have worked at an orvis shop and we sold a ton of them. Also, if you ever do have any problems they will fix it, no charge. We had a guy that had smashed his reel into pieces to get the line off, walked in with a bag of reel bits, and orvis replaced it. I have lost parts on my odyssey and they have replaced them no charge.
Buy it, for all of those reasons mentioned. I have a cassette reel, and I don't know why more people don't use them. Not only are they cheaper than a spool, they don't have handles sticking out and are therefore easier to pack around.
And, Orvis customer service is the best, but hopefully you'll never need to find that out. :HAPPY