Spinal Tap - I've heard about a lot of quailty issues with on DGCR. My friend has one & the strap ripped in a month. Normally Voodoo has great bags but I don't recommend this one.
Simian - I agree with what horsman said. The seat is nice but it doesn't hold many discs & its comfort isn't on par with like likes of the Ergo, Grip, Prodiscus ect.
Catalyst - its untested & unprooven by the masses. I don't like buying first run bags, I'd rather have other people be the Guinea Pigs. In general I like to go with tried & true bag companies & bags.
Ranger - Its an alright bag but I'd say its a little expensive for its quality. It only has one place to hold an umbrella or stool unlike most backpack bags. It isn't made out of as good of materials as the Grip, Ergo, GM, Prodiscus & other backpack bags. It also doesn't have a rainfly & the bottom of the bag isn't even close to the durability of a Grip or GM. All in all I think its worth just spending another 50-75 dollars on a bag that will last twice as long & have more bells & whistels.
Ergo - Made out of great materials, unique storage with multiple ways to set it up & a very solid bag overall. Its got more than enough disc & extra storage. I dislike the rainfly with the hood but it isn't a bad rainfly overall. The newest Ergo is better than the old one but they both are great. In the top three bags on the market IMO.
Golf Mahal - Tried & true bag that been out for some time now. Made out of great materials & is designed well. Can be collapsed for times when less discs/extras are needed. Has more than enough discs & storage space. Made for people who carry a lot of discs, food, clothes, drinks ect. In the top three bags on the market IMO.
Grip A-Series - amazing bag that is tried & true from a tried & true company. Top three bags on the market in my opinion. Has decent storage & is the perfect bag for people who carry around twenty discs. Great design & quality materials. The rainfly is awesome in the rain. Grip pays attention to detail better than most if not all bag companies. They also listen to their customers. The L-Series main complaint was it fell ovet on inclines easily so they fixed that on the A-Series. Grip even improved things that I would of never thought needed improvment like lowering the backstraps compared to the L-Series. It has some of the same components as other top bags but Grip did them better. For example the handle for carrying the bag short distances is made out of better materials than the Ergos & is intagrated right into the backstraps. Also the Grips rainfly is better than tbe Ergos. I think most backpack bags are ugly but the Grip looks sleek & professional. Overall its the best bag I've ever owned & if I ever need a new bag Grip will be getting my money.
I recommend the Grip especially because the grey & black A-Series is on sale. If you for some reason dislike the Grip I'd recommend the Ergo or GM.