I've begun the expensive descent into Ryobi tools. Impressed with my cordless circular saw, I am in need of an SDS drill. The Ryobi is sold bare and so was going to get something meaty to go with it, but noticed that the 3Ah is nearly the same price as the 4Ah. Clearly the 3Ah is newer with sales blurb about being more efficient etc. But is that efficiency worth the price? Does the 3Ah actually perform better than the 4Ah? If performance comparable then the reduced charging time might be worth a punt?