I’ve not ridden an elGuapo but my SuperMoto was fantastic. Up until owning that I’d stayed away from 4-bar bikes because whenever I rode any specialized and a mates 5 spot they felt horrible – mushy, energy sapping, unstable around the sag point, and just dead.
I’d always had single pivot bikes (mostly Orange & Cannondale), and loved the lively feel, instant feedback & their ability to somehow gain speed through rolling singletrack.
The best analogy I can come up with is that the SuMo felt just like this but without the locking up over braking bumps, great traction on technical climbs etc. I’ve no idea why but guess it must be pivot placement that influences this. To me they’re the manufacturer that showed me how a good 4-bar should feel.