You have to realize that Cadence is a chip design tool company. They give ORCAD and full seats of Allegro away to their IC design customers. I've talked to the old AD guys and they battle that constantly when trying to get Altium in larger tech companies. A full seat of Allegro is about $50K - and try to get basic signal integrity from Cadence (Sigrity) - I was told a years subscription is silly expensive.
Here's an example.
In Altium, there's an output generator that will great plots/PDFs of each layer, one per sheet configurable to show things like mech layers board outlines on all sheets. To get that same style of plot out of Allegro is something like an $11K option according to our VAR - it's tied into Advanced Package Designer. If you go thru Allegro help, you'll see alot of it is directed toward their IC tools....
I was an ORCAD customer back int he DOS days; when the first Windoized versions came out in 1995 (6.22 for sch; a bastardized Masstec eventually for PCB) it ate one of my dsn's so bad even tech support couldn't recover it. I jumped to Protel, which was actually had very similar key shortcuts to DOS SDT Orcad.
Every once in a while I'll update my Orcad Allegro thing; but I get the more expensive version since the only thing I really use is the Specctra autorouter (based on the old Cooper & Chan) - I have tons of DO files gathered over the years. Altium screwed that a bit with AD15 I think, where if you have more than one clearance it hoses the global with the largest size - but the dsn is ASCII so it's easy to fix.
More information on my lab and shop:
http://www.ajawamnet.comhttp://www.ajawamnet.com/ajawam3/swarf/swarf.htm