The flasher unit is a bit spendy, but it dramatically simplifies everything else. On my prev daily, 2007 Saab 9-3, changing any exterior light to an LED would be a nightmare (some combo of resistors & mechanical relays to satisfy CANBUS and the built-in filament health sensors). So, when I saw how easy this flasher made it for this car, I impulse-purchased. Also, shop around. Most places sell it for $90, but I found it for $60 eventually.
You could probably find a LED-friendly non-smart flasher for less, but I love having the tap signal. The LED thing was part safety, part aesthetics and part reliability. The range of LEDs is crazy, though. Morimoto and Diode Dynamics make some top tier stuff, and there's TONS of cheap no-name stuff. Lasfit seems to find a happy medium. Not had any problems with them yet.