I'm no pro...still doing my research on cars with Turbo. These things appears to need to be running in a more 'warmed up' condition compared to N/A cars - requiring careful, low RPM driving. By how much, was not mentioned - it varies based on size of turbo, and such. The Honda has a single-scroll turbocharger creating 16.5 PSI boost (what this means I have no idea yet). These T-Cars also appear to be better when running longer distance and not so favorable in city-traffic-jam driving because of the heat produced by the Turbo.
There are websites called Consumer Reports that do extensive research on Turbo cars that confirm the fuel consumption on T-Cars are absolutely horsesh1t. Lots of articles say the same. But I would state that this is completely controlled by the drivers right foot.
Maintenance wise, definitely more expensive compared to the N/A cars - requires more frequent oil and spark plug changes. Turbo has more parts so there are more items to replace when it goes - such as the intercooler. But you won't feel much the first 10 years of use if you look after it.
Final word - turbos of the olden days (less than 10 years ago) were a nightmare especially for abt 5% of the consumers. But modern technology is vastly more advanced in recent years making it more reliable than before. With mass production, replacement for turbo parts (for if and when it goes for our Honda Civics) will be cheaper than now. There is no problem with buying the Turbo car but do not neglect the maintenance or you will suffer - you best learn some maintenance techniques yourselves and don't depend on the Honda mechanics because I have yet to question their training and experience on Turbo car maintenance. There is no need to worry below the 100k mileage mark, its the 'after' that you need to worry.
finally, one person worries about the CVT. When you combine this pretty much new technology with the Turbo, it not only puts additional stress on the machine but also reliability issues into the mix. Turbos add stress onto everything - gearbox, spark plug, oil, tyres, AND brakes.
Would you put your money on two new technologies by Honda especially when the CVT on the Honda does not have good reviews overseas?
Lots of people think that Turbos are a cheap (but probably only) solution by the companies to achieve the target made by CAFE (Corporate Average Fuel Economy) standards. One by one, each US company starts putting turbo in their cars and others follow. Let's just hope that they care about us and do not act like Volkswagon and Mitsubishi.
No matter what, please do enjoy your car. Its a beautiful car and I'm never interested in Malaysian cars until I saw this fella

I'm actually still in the dilemma choosing between the 1.8 NA and the 1.5 Turbo. I don't drive like Jeremy Clarkson, but more like James May, captain slow. I do however tend to go "heavy foot" mode in order to reach 110kmh on highways. I need to know which would be more fuel efficient in the long run.
Based on what you have said, does it imply that the 1.8 would be cheaper to run, in the long run?
It's because I'm most likely going to use this car until... Well, you get the idea. I don't really fancy the idea of getting bombarded by high maintenance and fuel costs for the Turbo sometime down the line, even though the road tax would be a slim RM90 anually.