We used EPGY with DD10 before it switched to Redbird. We also used it for a while during the transition, which had many glitches. She lost interest during the glitches and we were ready to switch her to AoPS by then.

Is anyone using this with an advanced kiddo and if so, how is it now? Is the pace fast enough for an advanced learner? I might consider using it for DS7 if it has improved...