I happened to have tested this lens too (at a store), but have to disagree on a few points:
First off, chromatic abberation is not easy to fix. You can reduce it, but not completely remove it.
Secondly, the softness. I found the lens to be really soft at 300 mm (at least wide open). Photoshop's sharpening can only fix so much. Stopping down the lens certainly helps, but you'll be looking at very slow (impossible to handhold) shutter speeds then.
But then again, you're getting a 70-300 lens for a very small amount of money, which is a great lensfor the money. Sure, stabilisation would be nice. Same story for extra sharpness, a tripod collar and a quick autofocus motor. Which is all available, but at a higher price.
The macro (although not a true macro) is also a nice thing to have, I believe it focuses at one meter from the sensor?
Conclusion: Very good lens for the money, but be sure to test it yoruself, and know it's weaknesses before you buy it. Don't intent to buy this for indoors sports shooting