Extremely fast. I've spent quite some time on the Pro and now the LE. Both are fast, fast, fast and tons of fun. Pro is a little more chaotic around the middle as the stand-ups knock the ball around quicker than the drops do, but both are very hard to control. Expect missed shots to drain on both.
The LE has the swinging bell... wow... my favorite feature. Worth the price of admission alone. Just the perfect ACDC toy that does crazy fast things with the ball. Very satisfying to hit, even though you know you should avoid the high-risk shot.
Lower playfield is awesome. I was concerned it might be boring with few shots, but the loops are really tight and the targets are no gimme's either. Getting the ball looping around the the playfield is lots of fun - and fast.
The lighting effects are amazing even in this early version of the software. The GI can be all red all blue or all white (or combos). The effect is stunning although sparingly used at this point. LEDs look great. No flicker, no ghosting. The train and rocking band just add to the overall package and fill out the space nicely.