In general I can confirm, that most regulars won't have big ROI's in Turbo tournaments. Quite a lot of players are even playing them with a negative ROI.
Your skill edge is by far less important and therefore the tournaments are more suitable for weaker players, because their disadvantage is smaller.
In a normal MTT schedule Turbo's should be a very small part of the daily schedule that you play. You should play them mostly to fill up your tables when you reach the end of your registration cycle.
For example: If you register tournaments between 7pm and 12pm and bust out of some tournament at 11:30pm it makes sense to fill this space with a turbo tournament in order to keep your session in a reasonable timeframe.
If you have the choice to play tournaments with a normal structure and turbo tournaments you should most likely decide to play the normal structure.
An exeption would be the small turbo tournaments or mtsng turbo's (180s). The field sizes are small enough to have a big enough edge while the variance won't be too high.
Regards,
Asaban