I have tried Tak-On on my 7290 and 8700 and will buy it when my trail runs out. It works great for me for AOL IM (only IM I use right now). I also haven't noticed much battery usage, but I only chat about 30 minutes a day or so, 4-5 calls, 50-80 email and browse 30 minutes/day and my battery is lasting about 4 days.