I think the Allwinner may be a bit too new. Preliminary PR is good for the A10. That said ..I have a Onda Vi30W w/ the A10 on order.
My reasoning. From what I can see it's voltage is between 3 & 4 ...vs. over 7 for many others ...such as the RK2918. There is therefore less draw on the battery with the A10, which should make for better battery life. As for performance, everything I have seen tells me it does very well. When compared to say ..the Tegra2, I am sure it is not as fast ..but I have no doubt it it is plenty capable.