Works great, but missing a little polish
I just got done with messing with a nameless A/V switcher my brother found laying around and the Sima compares much better for what is an almost identical feature set.

A huge plus is that the Sima doesn't require any power whatsoever. All switching is done via hardware and you feel a distinct clicking sound when you press a button to change the source.

I only worked with RCA in and headphone audio out, but those were solid and served my purposes.

My primary gripe about the unit is a cosmetic thing: It's all black and since there are no LEDs (due to no power - good thing), it can be hard to determine which source is selected in low light when looking at the front. It would have been nice if they could have used some paint on the button edges to help you discern the edges more quickly at a glance.

I'm glad I got this thing and it did exactly what it advertised for me.

Output to TV for DVD, PS3 and cable box
Note the PS3 input is component not HDMI or composite. I have a junky TV so the HD quality isn't really represented, until I upgrade the TV. It is a good manual 4 input selector. Not too hightech so nothings gone wrong so far.

Don't forget to buy an a/v cable
This is a good product with a great price, but don't forget to buy an a/v cable to connect this switcher with the TV, it doesn't come with one included!

Works as it should
I have a low-budget tube television with only 1 set of A/V inputs, and this device allows me to use DVD, VCR, X-Box, and a PC, all with the one input. It has very low interference, and looks great on each of the 4 inputs. I have a 5.1 receiver with A/V routing, but receivers tend to add a significant amount of fuzz/static. This is common with budget receivers, so I would recommend this as an upgrade from that specific application. This would work EXCELLENT as a video game switcher for older non-HD systems (gamecube, dreamcast, SNES, etc.)

Input selector
This product does not alter the signal so what goes in is what comes out. However it does its switching without degrading the signal. It also works in either direction, so it can take a single input and switch it to 4 different outputs (only one output at a time, however) or take four inputs and switch any one of them to the single output. Should solve many switching problems cheaply.