They were made for several years, so it may not be wise to generalise. What is true of a 1994 prototype may not be true of later frames.
I don't know about the earlier ones, but by 97 or so they were made of Easton Elite, and later from Easton Ultralite, so it was the best aluminium tubing available and there should be no question of either thin tubing (the Elite tubeset was to a standard specification) or of poor welding techniques, as Easton only sold tubesets to builders that they were happy with.
I've never had one, but I've always assumed they were very good frames.