With todays use of smaller turbo's, the "lag" is much less than in days of old. Many of the newer cars if you weren't told it was a turbo, you'd never know. They have been designed to give a much more linear power delivery. The biggest thing is that most turbo engines require premium fuel. This is mainly due to the higher temp of the intake air. Even with an intercooler to cool the compressed air going into the combustion chamber, it is still higher. So there is the concern with pre-ignition. And since all new turbos are oil cooled, you will or should use synthetic oil to keep the oil for breaking down to the high temps in the turbo.