I had the Maxx for a year and Maxx HD for a year. There's no comparison between the two as far as speed and lagginess. The Razrs where extremely slow in doing anything by the end of their life. The jump to the new hardware will be extremely noticeable for you. Now, having said that, There's a large size difference as far as top to bottom. I could use my Razrs one handed easily. The G3 is not a very good one handed phone. I've only had it since last night, but I can say that it is quite a bit bigger. As for battery life, I doubt it'll last as long as my 2 Maxx's but I bet it'll decent and get me through the day. I'll find out today. Also, since the battery's removable, that takes it to a whole new level. I don't have either Maxx left, otherwise I'd upload photos of the size difference. It'll take some getting use to, but it's so smooth that you probably won't mind the additional size.