I love them, but you need to remember that if you are getting a slab of granite that it is extra money because the hole for the sink to fit in needs to be finished and polished as its on view. not sure about practical side of it, I can't imagine there being a problem with them.
and hey, I am 42 and only just got a dishwasher for the first time 6 months ago, yay, ok so far I wash most of the dishes in the dishwasher, but sometimes there are a few things that are either not suitable for the dishwasher or too big, but not many, at the moment I still have a sink with drainers on the bench, but when it is just a sink no drainers (which is the plan) I intend to just sit a tea towel on the bench with a dish drainer on top of it for the small amount of dishes that do need to be done
ps my sister has a dishwasher and says she hardly uses it and washes her dishes by hand... pffft buggar that for a lark, I grew up in a family of 8 people having to do the dishes every night.... and now have family of 5 I've been doing the dishes for ... honey, if it fits in that dishwasher, its going in the dishwasher!!