Andy can you compare Celero Wood to Zoom Balance in terms of topspin play ?
Sure. Despite my Celero being 84g and the Zoom being 92g, and the Celero being quite a lot thinner, the Celero plays harder and stiffer. They both play a general topspin game really well, but the Zoom has more tolerance for errors simply because it's slower (and of course it generates less threat for the opponent). I find they both have a similar medium/high arc, a nice solid wood feel. The Celero has more power in the medium gears and can take you by surprise when you start driving in earnest, and as such it works better when further away from the table than the Zoom, which needs more effort (esp with lower catapult rubbers).
The Zoom is essentially a well-made, well-priced, chinese-made variation on the Primorac/Powerwood theme. The Celero is harder to pigeonhole, but the best I can say is that it reminds me of a supercharged version of the older Tibhar Samsonov Alpha (not the new junky one with the blue handle). They're both good blades in their own right, but I don't need the extra speed the Celero has with my current rubber selection.