Yeah, I'm a major fan of Eclipse Phase, so this shouldn't come as a shock to anyone, but Rimward is absolutely amazing. It lives up to my expectations, delivering Posthuman Studios' high quality and insightful transhuman setting in a simple package.
Rimward is 90% setting, and about 10% numbers, but when you actually look at it it's well worth it-everything is written in such a way as to detail the universe of Eclipse Phase and be a great asset to players and game masters, even if it's not a list of numbers on a page. It's actually a joy to read, with a boatload of new content.
All-in-all, I'd say Rimward is the perfect supplement to Sunward, and makes Eclipse Phase that much better as a game-my normal caution about Eclipse Phase not being for the kiddies still applies, but other than that it's a top-notch product I recommend to anyone who likes Eclipse Phase.