I have the steel framed Swift with planet bike fenders and I finally replaced my marathon plus' with big apples tires. I have only ridden the bike 50 miles with them and can feel the difference.
Until April, I have only ridden road bikes with drop bars. Since the folder has a straight bar, I will need more hand positions as well so I probably will enventually try some bar ends. I did get a Nashbar stem extender for under $5 to extend my stem riser by 2". When I go out for a long ride I like to do at least 50 to 60 miles. I would love to average 80. maybe with the big apples I can.
Since this is my main bike now, I have ridden about 1900 miles since April.