I am considering buying an ab wheel. Will exercising with it make my abs look stronger and more apparent?
I'm not sure if an ab wheel will have a substantial effect on my abs in a short time. Lower and up abs I think will blow up.
Ab wheels are a great tool, but unfortunately, that alone won't give you visible abs.
The bottom line is that no matter how well-shaped your abs are, they won't be visible unless you burn the fat that covers them.
In other words, I do recommend ab wheels. I love them. But the real way to get visible and toned abs, is to get your diet in order. Both these things combined will have the effect you desire.
Since this is a very commonly asked question, I'll refer you to some similar questions with decent answers.