Hi, I've decided to take up the bass guitar.

I already play a normal guitar so I'll be doing this second to my normal one. I was looking for a cheap but good quality bass and saw the Yamaha RBX170, does anyone know if this is a decent guitar and has anyone had any experience with one? If not can anyone recommend a decent one.

Haven't had experience with it, but I've heard quite a few good things about it.
Nope, no sig here.
You can never go wrong with a Squier (I almost said Peavey!) Jazz.

Oh and I haven't heard anything about that bass.
My guitarist has a shiny purple one of those. It's an alright bass, the body is really small and feels odd if your used to normal sized basses.

For a beginner bass, it's decent.