The friction stickers it comes with are very responsive. When you buy the yo-yo, I would also buy some white "Kimu" pads, and some Paul Yath carbon fiber stickers. Start with 2 Kimu pads, then take off 1 pad and put a Paul Yath on there, then put on 2 Paul Yath stickers, and then only 1 Paul Yath sticker.
I also own 2 Element X's and I must say they are a real bang for the buck. All Element X's use size B bearings, unless you have Large SPR spacers. The remix uses size B.
I happen to own a chain reactor. I wouldn't suggest getting one. They're way to responsive, and they have a really small string gap. If you like yoyo's made of metal, I would suggest either Duncan Metal Zero or a Metal Zero Hollywood Edition. They both are availible at yoyoguy.com. Personally, my favorite yoyo is the X-convict.