Jody, I've smoked several of those. They're usually USDA Choice, and come out great. No complaints, and much cheaper than the Prime that Sam's carries during the holidays. Smoking low and slow, I can't tell the difference in tenderness (I've done both).
Kevin, it's not very big, and you're only smoking to 128 for med-rare, so I wouldn't plan on a rest longer than 30 min to an hour. You can sear it after the rest, right before serving.