I think the Burner line was discontinued a couple of years ago already.
The KSD models are built in the Far East, and from what I've heard they are pretty good for what they are - mass produced, affordable Jazz copies. I may have picked one up from its stand in a store once, but I can't remember playing it.
It could be me, but I once picked up an all-wood Modulus Jazz copy from its stand, and it sounded so horrible acoustically that I didn't even bother plugging it in. I always liked the Yamaha offerings in the lower price ranges, even the passive ones.