Sorry for the late reply, skyline.
It was not limiting, for my purposes, especially since there's two octaves, and an extra key up top. The octave up/down key was very well built, on the renowned Akai pads, and worked flawlessly (no delay). Because there are two octaves + 1 key, there won't be a situation where you'll be unable to use the arpeggiator (which is cool, once you figure it out, btw) to get a chord you want.
I actually ended up exchanging it for the LPD8 pad controller {which is phenomenal, btw}. I'm definitely going to re-buy the LPK25 when I get the money, but I found that I'm not as proficient at the keyboard as I remember. If only they had a saxophone shaped MIDI controller!
Hope this helped. My advice: go to a Guitar Center shop, and ask to play around with the keys (for laughs, play around with the NanoKey, and you'll see why I was so happy to find out about the LPK25). They (LPK25 keys) are nice and very sensitive to velocity. I bought both controllers from Guitar Center, because their prices were the same as Amazon (of course, with tax, though) and their returns policy is great (I lost my receipt, and the first LPD8 had a faulty input jack).
Also, it goes without saying, I think, but buddhashenglong's comment applies to this controller.