As Si says, they are 3 different designs. The Chumba is a 4-bar, Intense a VPP, and the latest 5-Spot is a DW. I have ridden a number of 4-bar bikes (old HL Turner 5-Spot, Ellsworth Truth, and Titus Motolite), a couple of VPP designs albeit the 1st version rather than VPP2 (SC Blur, Blur LT, 4x, VP Free, and Intense Slopestyle), and a couple of DW designs (Ibis Mojo and DW 5-Spot).
4-Bar – nice and plush, no influence of braking forces, but needs pro-pedal to insulate any pedal-induced bob.
VPP – no bob, but hits when pedalling in granny ring can lead to some kick back through the cranks. From reviews, this seems to be much improved with VPP2.
DW-Link – no bob, no kickback, nice and plush, sprints well
I personally think the DW design is best but clearly I've only ridden one of the bikes you mention. I currently own and love the DW 5-Spot – it's not especially light, but rides beautifully and feels pretty bombproof. I would note that the Spider probably compares more closely to a Flux – the Tracer would be a more direct comparison to the 5-Spot.