Well, I started playing in an Earthdawn campaign under first edition that modified to second edition when it came out. Mostly the change was seamless, with neither players nor GM noticing very much. A few Disciplines were rejigged, so it was worth checking out your character again. And new PCs got more skills than old, but we handled that by offering boosts to older characters in line with what they'd already done.
Overall, I prefer the Second Edition rules to First. There are still holes, and still bits that need clarifying, but then most systems do. I do particularly like that Skills play a larger role. As was commented, under First edition, a Warrior was a Warrior was a Warrior. Tell us your race and Circle, and we can guess your Talents. The skills now give the same character a different flavour. With the right Skills, a Third Circle warrior might be a hunter, a bodyguard or an airship marine.
I am still interested in RebdBrick's own version, and I have few doubts that many extant campaigns will hybridise as suits their own style. Earthdawn requires a lot of input from the GM and the players to get the most from it. But it is worth the effort.