What do you want to do with it? If you're looking a decent trail pack, their are lighter (and less expensive) options. With the construction, they are "overbuilt" which makes them pretty heavy; however, that's the beauty if you have activities that could abuse a typical pack. With that said, I have an EMR, two Scouts, Pointman and Zulu. I really like the Zulu; I have that here with me in Afghanistan.
The EMR is a monster-sized pack. Depending on your area, I would get a solid color: tan/coyote brown, OD green or foliage.
I think Kifaru's piggy-back options are excellent; custom service is top notch and they have several other excellent products. They are expensive, but again, if you want a bomb proof pack...it's near the top of the "pack" (pun intended

). A couple of my packs have deployed with me and my Zulu has been punished quite a bit just traveling around...it's gets thrown, sat on, smashed, pulled, dropped, kicked, you name it. It's holding up just fine but not something I would expect my civilian packs to withstand.
For size, you really need to determine what you want to carry and how much capacity will be required. I like their ZXR pack for a full-szie...good size that you can compress or expand to carry enough for a decent trip or adjust to seasonal clothing. Additional pockets are a plus, but you can add a lot of weight with pockets alone, so just be cautious. Kifaru's suspension is incredible...one of the best I've ever used. One the smaller end, I like the Zulu...it's about the same size as an ALICE pack.
I've had no issues and I've had my EMR for about 10 years now...just needed to replace a couple of broken fastex buckles, but it's still looking like a new pack.
ROCK6