I purchased this system recently and did one studio session and a full gig.
So far, the battery has been great, lag is not noticeable and the sound quality is just as good as a cable if not better, also, there was no disturbance with wifi networks or other frequencies etc. Go for it and there is not much to think with bajao's two year warranty I think, although I hope I don't find the need to have to claim it.
Good product and timely delivery by the website.
One thing to note is that to ensure that the transmitter stays in its place on my guitar, I had to buy another cable with a male and a female 1/4 inch jack and I taped it on my guitar strap since I am quite active on stage and things can go wrong if the transmitter unplugs itself, so consider it if you plan to go crazy with it on stage.