i just "upgraded" from a centro to a samsung trender. it does pretty much all that i used my centro for but the screen is only touch so it actually works better for internet bec u can scroll up and down very easy and it has a bigger screen. it has a slide out keyboard
my centro - the keys just stopped working on me in middle of nowhere, and this was on a "new" phone that i got just a few months ago after the last one also stopped working suddenly. so i decided it was time to change.
the touch screen is a bit annoying bec its easy to click on the wrong thing (i miss the stylus) and i dont really like that u have to slide a "button" to answer and end a phone call and also that i have to click on each message to reread it as opposed to just seeing the whole thread but other then that i like it.
it also helps that i can check my hotmail (which i couldnt on my centro) it also has facebook and twitter. i didnt check it out to see how well/fast it works, but in general the internet works at similiar speeds to the centro
they dont charge the $10 for it and it costed $30 with another 2 years and a one time upgrade/connection charge