I have owned an iPhone for almost a year now, and my issue with the
touchscreen interface is not that it is hard to hit the keys
accurately the on-screen keyboard.  My issue is that on a device with
a hardware keyboard your thumb(s) can be on the keys to hold and
steady the device, without pressing actually pressing the keys.  
With the iPhone your fingers and thumbs have to be completely off the
surface while you are typing, making it more difficult to hold and
type.  You either have to balance it gently on your finger tips using
it with one hand (gripping it means your thumb can't reach the
"near-thumb" side), balance it on the fingers of both hands for
two-thumb use, or grip it in one hand, and finger-peck with the index
finger of the other hand (a slow method).
Overall I like my iPhone because I don't do a lot of heavy typing,
but I have a lot of experience using Windows Mobile phones with
hardware keyboards and it is definitely ergonomically more
comfortable (for me).


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Posted from the new ixda.org
http://www.ixda.org/discuss?post=33524


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