So, to reiterate, Spyderco gives you all the performance you could ever need, at the least possible price. For the extras, go to Benchmade. the arguments or Benchmade, essentially, have been as follows:
I want the AXIS lock
I want full steel liners
I hate FRN
I hate lockbacks
Spydercos feel cheap
Now, I've never seen a need for the AXIS lock. Lockbacks have always worked just fine for me, and on my Griptillian, as much as I love the blade profile and the ergonomics of the handle, the tiny increase in "smoothness" from the AXIS lock doesn't remotely make up for the decrease in function from the thick blade or the oval opening hole. And Spyderco doesn't include full steel liners because, according to their exhaustive testing, the liners don't actually increase the strength of the knife. It's counterintuitive, but the pins go before the handle does. In my opinion, all the liners and AXIS lock really do is add to the price of the knife. That's my opinion. If you like the AXIS lock enough to pay extra for it, then Benchmade's the only way to go.
And all of the criticism I've ever heard levelled at Spyderco boils down to one of two things: "they all look the same/they're not innovative" and "FRN/lockbacks/non-adjustable poivots just feel cheap to me". The first point is so unbelievably, spectacularly wrong that it's hard to figure out just how to respond to it.

Just looking at the first few pages of their online catalog, I see two different rescue knives (one in H1), a stainless/Ti heavy-duty tactical, a fixed-blade skinner designed by Bill Moran (in two different blade profiles), an economy knife, a folding fillet knife, a large everyday folder designed by Frank Centofante (with the thinnest blade you'll ever see on a production one-hander, BTW), a monster lockback by James Keating, a giant, fully-serrated reverse-S "last-ditch defense" knife, a tiny little reverse-S Cricket, a hawkbill economy knife, another rescue, and four different flavors of Delica (FRN, SS, carbon fiber, and trainer). That's two pages out of ten. And do ya wanna talk about the current limited editions and the catalog update flier? They innovate.
As for "feeling cheap", well, that's what the whole deal boils down to. Are you willing to pay extra for the prestige features that Benchmade offers? Even if it compromises the knife's function with a thicker, saber-ground blade? The answer may ver well be "yes". Function isn't all there is in life; beauty's important, too. I'll admit I spent over a hundred dollars for my bone-handled Kiwi and a William Henry sheath to go with it, when my $30 Meerkat would've done the same job just as well. Hell, the Meerkat may even have better edge geometry. But the Kiwi's so pretty...
If you want a knife that the average person'll be blown away by the first time they see it, that you'll be really proud of every time you look at it, and will do everything you want it to, and you're prepared to spend extra for that pride in ownership, buy a Benchmade. You'll never regret it.
If you want a knife that's "everything you need and no more", get a Spydie Calypso, and cultivate a subtler appreciation for the thinness of the edge, the perfect control of that finger choil, and the relationship between you and that knife. It trusts you not to abuse that thin point by turning screws or throwing it at trees, and it rewards you with the best performance you'll ever get out of a one-hander.
To me, it's a lot like choosing a woman, actually. The flash-bang of a gorgeous one is really impressive to everybody who sees her on your arm, but an intelligent, deep woman'll still turn you on after the New Relationship Energy's worn off.
