I have a Kyosho Fazer with a Maclaren F1 bodyshell, bought as a ready to run. It's all the fun you expect it to be, and more. Starts easily, runs really well and everything you need is in the pack. Kyosho perhaps have a better parts backup, which I needed before the engine was fully run in. I clipped a curb at maybe 10mph and it flipped end on end five times, snapping a front driveshaft in the process. It is pretty much uncontrollable in two wheel drive
In addition to the kit, I'd get a better glow plug starter which clips and holds the glow plug. The standard one is a bit of a fiddle with the wires and rechargable ones are just better.
Having said all that, electric is much less hassle. Turn it on, go. No messy oil residue, much less noise. When you're driving a nitro car, you tend to draw a crowd (good) or annoy the neighbours (not so good). I can drive my Traxxas Slash up and down my street all day without anyone hardly noticing. The Fazer is equivalent to someone using a lawnmower. Depends on your situation.
The flipside of the flipside is that nitro cars are just way cooler. Much more real, much more fun but a bit more work.
I intend to buy the Haynes RC Car Manual purely to give me a better insight into tuning.