I’ve got a whippet/collie cross. Never really considered getting a whippet. Not sure I can comment much on general traits as not sure how much of Barney is whippet, how much is collie and how much is Barney. However if I was ever going to get another dog a whippet/lurcher would be top of my list.
Ours is six months old and still behaves like a Tasmanian devil a lot of the time, steals anything he can get in his mouth, won’t come back when called, desperate to play with any other dogs/people we see when out.
Ours is 2 and all of the above still applies, although he’s not that bothered about playing (ie scrapping) with other dogs much anymore. Loves to be chased though, will deliberately annoy other dogs in order to encourage them to chase him, he will then run them into the ground, much to some owners delight. Barney even has “play dates” for precisely that purpose. Love to see him run.