I've riding a Cotic BFeMAX for over a year as my trail bike going full hardtail and letting my FS bike gather dust. We had some great adventures and I documented my thoughts on that bike at this link. I wanted a SS friendly frame for my winter bike this year and I wanted to "fix" some geo issues I had with the Cotic. Mainly that was wanting a frame with shorter CS and shorter WB for a more agile/playful ride. I ride a lot of tight techy forest trails so being able to get up on the rear wheel and maneuver the bike quickly is important to me and I enjoy the feeling of manipulating the bike vs. being along for the ride on a bigger frame.
So I pulled the trigger on a Pipedream Sirius S5 hardtail. It's main claim to fame is an aggressive geo designed around a shorter travel 100mm-120mm fork. It also happens to have sliders so that makes for an easy/clean SS setup.