While I haven't built the Lil Orange Phaser, I have built several of the Classic Phaser kits. (I built a couple more using their PCB and sourced my own parts, too.)
The Classic Phaser is among my favorite Phase 90 clones. It can be made to Script or Block specs, even switchable between the two, it uses matched transistors and the rest of the components are excellent quality. By the time you pay for the kit and shipping though, it costs about the same as an MXR Phase 90.
IMO, the BYOC sounds far superior to any stock Phase 90 I have owned, and there have been several. The build quality and tone are right up there with the Whirlwind, Retro-Sonic, MojoHand and VFE phasers I have, albeit without some of the bells and whistles some of those pedals have.