I've had a few discs fail verification before so I think it's worth it.
It's a coaster and I burn a new disc....But what do you do once it has failed verification?
Then again I use a 20x external to burn my discs...Exactly. There's no real benefit finding this out from your computer versus finding it out the first time you use it other than the fact you may be relying on the disc. If it's taking a long time to verify but you are relying on the disc working first time, then 'verify' it yourself by cancelling the process and reinstalling the disc into your Mac to check it manually. It most likely will be immediately ejected if it failed during the burn process.