Actually, Plants vs Zombies works perfectly on my 7-inch Samsung Galaxy Tab. If there's a problem with running Plants vs Zombies in Android, it's not the screen size that is the problem--it's very likely something specific to the S7, otherwise why would it work on mine but not on yours even though they're both 7-inch tablets?

As for battery life, it varies a lot depending on what you're doing. Typically, I can easily go about two days without charging even while listening to a LOT of podcasts over bluetooth. (And this precise scenerio has happened several times now.) Are you saying battery life based on playing a video the entire time? Just playing MP3 with screen off? I hate it when these numbers get pumped out without details... but in my case, the battery life is PHENOMENAL and that's with Android 2.2--which was a pig of an OS for battery life, I can only IMAGINE how much better it'll be with Android 2.3 (if Samsung will ever release it on the SCH-I800 for Verizon). My Motorola Droid used to be pretty "meh" on battery life on 2.1 and 2.2.. but once I slapped on Android 2.3, the battery life has got to be nearly doubled or better on most days even with phone calls and data usage.

On the question of my own usage--I carry my tablet with me EVERYWHERE obsessively. I now use it, effectively, as my new N800 replacement to let my Droid maintain as full a battery for as long as possible by shifting all my heavy usage to my tablet. It fits perfectly in my pocket, so--why not? I mainly use it to download and watch/listen to video and audio podcasts, I also use it to immediately Google up information impulsively or to post/check status on Facebook/Google+ on-the-go and I use it to ssh back home to check things going on around the home's Linux server. I've also been REALLY lucky to have been able to use it during a two-day power outage when we had that massive tornado come ripping through Springfield, MA. Even while the power and our cable-Internet was out, I was still able to use the Flash player in the browser to browse our local TV station and watch the tornado news LIVE streaming all while my cell phone was free to make and take calls and texts and save power there. Plus--FLASHLIGHT! Anyway--there's my testament to having a separate 7-inch portable tablet. Big enough to share the live feeds with the neighbors next door... small enough for me to turn it off and slide it into a pocket as fluidly as a magician makes something disappears--and none of that without screen-size issues, by the way.