For the record this is my first smart phone. I read literally hundreds of reviews and comparisons, watched videos, went in and tested and handled countless models and studied the three main smart phone operating platforms.
I purchased my Infuse about two months ago and I am thoroughly impressed and satisfied with it. Yes, it is a little bit older technology (only a single core processor). But honestly, when I have compared it to much more expensive phones, the extra speed you get from the two cores is not worth the extra money you pay. Here is why I like my Infuse so much:
1. It is stable. I have had no freezes and it performs wonderfully.
2. The camera is excellent!
3. It upgraded to Android 2.3.6 Gingerbread about a week after I bought it and that was extremely welcomed. (I bought it knowing it had 2.2 and may never get 2.3.6 so this was a HUGE plus).
4. It's has a beautiful, bright 4.5 inch screen that makes it actually usable. (I don't think I'll ever get anything smaller than this, this is what makes it useful and realistically a do everything device).
Now here is what I have done to my phone to dial it in just right:
1. Went to the Android Market and downloaded Go Launcher. This makes a huge difference in the performance of the phone.
2. I didn't go app crazy and indiscriminately download all kinds of stuff to my phone. I shopped pretty carefully and test drove a lot of them and dumped a lot, but kept the ones I found worthy.
3. I don't run a bunch of goofy widgets on my phone, actually just one the Go Weather widget. You have to realize that if you have all this stuff (Widgets & such) running in the background it's going to use all your RAM (memory) and your battery and pretty soon you'll be saying "Bad Phone! Horrible Phone! "
4. Skip the app killers and Battery Defenders and all that. Why? 1) They take up system resources (memory and battery) and 2) You can use the stock Task Manager or one that is embedded in the apps screen with Go Launcher. This phone has a half a gig of memory and it runs pretty well with it but after a long session of browsing,
checking my calendar, making a few notes and doing other stuff, I'll just go in and with two taps the running apps and process are all cleared. (You have to remember to reboot it once in a while too - but how tough is that?)
The battery is a little weak on this phone but it is adequate. I do everything I want: Use the phone, surf the web, take pictures, use my calendar, etc. It lasts O.K. I don't set my screen on auto bright I just keep it at about 60%, which is bright. Sometimes I run it full tilt but I usually don't need to, the screen is just really vibrant without it turned all the way up. I do turn off my data connection and / or wifi when I don't need it, and I don't keep my GPS on unless I need it.
The GPS is solid, the data and wifi are easy and reliable, the speeds are great most of the time and I am just really impressed with the device.
Two final points.
One, get a decent case (I have a Ballistic SG two piece case. Yes, it adds some bulk but it also adds a lot of protection. (You can skip the screen protectors, it has Corning Gorilla Glass and you don't need them).
Two. Don't reduce your life to a 4.5 inch screen or 3.5 or whatever you wind up with. Life is the people and world around you. Don't pull your phone out and stare at it every idle moment. Connect with people, make eye contact, smile, take in the world around you, use all your senses. Don't reduce the world and your life to a phone.
It's a great phone / mini-computer. I highly recommend it