Well guys (and girls)... have given 2.2beta1, 2, 3 and 4 a go. I find it difficult to quantify kernels. Oh sure, there's Battery Usage, BetterBattery Stats, AnTuTu, SmartBench and CPU Spy to give you the statistical breakdown of what a particular kernel is, or is not, doing but there is also, as I call it, the "feel" of the kernel and how it interacts with your particular ROM and, more importantly, how each person uses their phone. Sure, we've all seen battery lives of 3, 4 or 5 days being posted but I like to use my phone every now and then and not leave it in a catatonic state with everything disabled just to get an extra few hours. I don't really see the point in having a great smartphone like the SGSII and then not using the features and effectively crippling it. So, I have Homescreen live widgets, news and weather updates, email polling, GPS, Auto and Background syncing as well as WiFi enabled. The same applies to "speed tests". Great, set your phone at 1600MHz and performance governor and then go flat out to get the highest scores. Whilst interesting, that setting will shorten your battery life in no time. I suppose, in a perfect world, we'd all like a 3 day battery life with top notch speed but instead we have to make compromises that we can live with such as undervolting or choosing a governor that will give a little extra when you need it or enable smoother scrolling or faster page loading. So, when I see postings that say, "what's the best kernel" (or indeed, the best ROM) the simple answer is... whatever suits you best I guess. Now we've had 4 beta kernels out in a couple of days, which really isn't long enough for me to give a definitive opinion as some of them I've only used for half a day. However, for my real life usage and my ROM, so far the best kernel is beta1. It was the best for me on battery life and wakelocks (or lack of) and felt quite smooth. A similar thing happened with Siyah 2.1. In the end the 2.1 rc2 kernel was better for me than the final release. All I can say is that I've had no Forced Closes or Screen of Death with the 4 beta's and that any of them are good enough for day to day use and are an improvement, for me, on previous versions. Having said that, it will be interesting to see what Siyah beta5 with Tegrak's second core application enabled. UPDATE Now that I have had a little longer with beta4 I have to say that I can put it on a par with beta1. This is because in the 3-4 hours I monitored it originally it did not appear to go into as deep a sleep as beta1 and seemed to show more awake time. All my observations are based on "smartassv2" governor, 100-1200MHz, no Profiles, stock voltage and my medium to heavy usage.