I have heard good things about them although when I checked their website thought they were sky high on price. No one can beat xtreme on quality or price. Buy in bulk on cyber Monday sale price coupled with free shipping. Buy cheap and stack deep.
If you sign up to their mailing list, you will get 5% and 10% coupons. In fact, there are a bunch of standing 5% coupons that are perpetual. Also they have free 2-day shipping. I think Xtreme has free shipping as well, but it takes 7-10 days to get here.
Jake (RMR owner) is a really good dude who has done well for himself and adds a personal touch to all of the sales. He has 6 kids now, and is a young beautiful family. I have no problem supporting him.
That being said, I have never had any real issues with Xtreme, but I do prefer RMR's jacketed bullets to the Xtreme plated bullets.
Sometimes, it is more than just about the cost. At least for me it is. (Although, I do not think his prices are "sky high" as you mention, they are actually fairly comparable, especially with the coupons.)
It is all good, Xtreme or RMR... It is nice to have choices.