It's long and as strange as you'd guess. Eminently worth it, though. I accidentally got deep into the rationalist fiction community (which means anything from the denser side of Yudkowsky to merely making sure your plots are idiot ball-proof) and am really loving the output. Scions include Ra HPMoR Worm This retelling of Superman (?) and Luminosity. Turns out you don't have suspend disbelief to write/read good fiction!
My favorite is HPMoR, which imo is the most well written. Worm is second best although...substantial. Honestly, I couldn't get into a lot of the other ones because of the "fan fic style" they're written in, it immediately takes me out of the story. Have you read any Neal Stephenson (I'm sure you have)? He has a similar writing style.