A better example might be Alpha, but their projects were notorious for slipping years. Probably because the poor DEC guys didn't know who to call "boss."
That is an unfair characterization. While DEC was an independent company and the ADT was properly funded they had a perfect record of delivering Alphas on or before schedule and at or above clock frequency and performance targets. This was an even more remarkable achievement when you consider they were rewriting the book on high end CMOS MPU design. Their delivery track record worsened gradually under Compaq as resources failed to keep up with growing chip complexity but to no worse than the industry norm. It was only under HP that Alpha slips became really bad. Considering HP wanted Alpha dead and buried as soon as possible that is hardly surprising.
How much Merced slipped depends on how you interpret early IPF roadmaps (e.g. does delivery mean sampling to OEMs or shipping in boxes to users) but it was at least 2 years late. McKinley and Madison 6M shipped on schedule while Madison 9M slipped 4 or 5 months.