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You would have to get a WiFi card to get WiFi on the 2215.
I might be biased, but I think the 4155 has a very good screen and is quite speedy.
Others will have their opinions though. I would take a look at some reviews with some benchmarks.
The cons of the 4155 is that there is the infamous "yellow screen problem" - if you hold the screen at some angles you see a yellow tint. I find these angles to be angles where I rarely hold it, so it's not a real problem for me.
Other than that, I love this thing.
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