The following picture goes like this, and none have topcoat:
Thumb: 2 coats of Call You Later
Index: 4 coats of Frenzy (to save all from seeing my stained nails)
Middle: 1 coat of Call You Later over 2 coats of Show Me The Way
Ring: 2 coats of Show Me The Way
Pinkie: 2 coats of UFO
Application is easy and drying time is pretty fast, and IMO they compete quite well with polishes of much higher price brackets. I've never worn them for long periods of time, (it's unusual for me to wear the same polish for three days) so I can't talk much about longevity, though. With a wide range of colors and finishes, it's an inexpensive indulgence that you won't feel bad about later...enjoy!