Thanks for the tag and kind words
@cocaseco! As others have said, DropCatch is by far the best when it comes to backorders. The fact that Andrew Reberry has about 40-50 private registrars under his belt gives him the ability to send more requests than most other backorder companies out there (I think Pheenix has maybe a dozen or so registrars under their belt)..
Pool is pretty old school and doesn't catch much anymore these days. If there is a domain you really want it's probably better to backorder it with DropCatch, NameJet, and SnapNames. One of the three will more than likely get it. The downside to DropCatch is the public auction thing.. I'd say the level 2 guys would be Pheenix, DynaDot, Name.com, BackorderZone..etc.
Once again, if it's a domain you REALLY want and think there will be competition for, backorder it with NameJet, SnapNames, and DropCatch. Then, get your money ready for the auctions because other people will have backordered it as well. I think it's probably next to never when a premium, semi-premium, or LLLL domain doesn't have any other backorders these days.