LOL, you two are funny.
First the comment about Campy Ergo doesn't work as well as Shimano SIS is true...but neither does Shimano STI, I know because I have both Campy Ergo, Shimano STI and Shimano SIS in 2 different flavors and it's been confirmed by other users who have used both that SIS was faster, in fact the reason Shimano developed (developed not invent) Di1 was because it was getting some ridicule about the fact that SIS was faster so the only way they could get a derailleur to work faster (and keep up with SRAM) was to go with electronic shifting.
Second Campy made of lead is not true because both Campy Super and Record is lighter than Shimano Dura Ace, and both Chorus and Athena is lighter than Ultegra!
Third Shimano did invent stuff including the commented on SIS technology, as well as RapidFire Plus, integrated shifting system, V Brake, Hyperglide, freehub, and SPD.
Forth, the most reliable components goes to Suntour, but in modern times Campy wins that department along with the ability to replace small parts instead of replacing the entire part. Campy is the only one that makes a completely rebuildable shifter, the only one that uses bearings instead of hinges on the front derailleur pivots.
Sram however is the fastest shifting component manufacture, some say it rivals SIS, but the durability is not up to par with the others.