#1
I was wondering, how easy are these to build, and what do they play like when they are built?
#2
According to most who got the Saga kit, you'll probably end up replacing the tuners, the electronics (pots and switch and caps), and the PUs.

Otherwise, they're a fun way to learn about putting together a guitar and refinishing and a bit of electronics (you'll need a $12 soldering kit from Radio Shack so you can do the PU and electronics upgrades).

Go for it or buy a used Squier or Ibanez.