The limit on manual keywords could be higher.  I personally wish we could input 10,000 keywords at a time, instead of 200.  However, I understand the costs that Long Tail Pro has to maintain each time a new manual keyword is input.  Not a deal breaker, I just wish the limit was higher. (To be fair, I don't think most keyword tools have a bulk manual option at all).

Here is the part of this post that we’ve all been waiting for. How to make Long Tail Pro pay for itself! I can tell you with absolute certainty that all of this isn’t just fluff designed to try to get you to buy the product. I’ve actually done all 4 of these things – and I continue to do the top 3 to this day! This stuff really works and I make WAY more than enough money, as a result of using Long Tail Pro, to pay for itself.
It would be great if you can provide comparative analysis of this tool with Google Keyword Planner. Since you’re using this tool so you can provide best comparison. One differentiation which I understood is that this tool works for yahoo and bing as well whereas Google keyword planner works only for Google but Google being a dominating search engine, gives the highest returns, so only this reason may not be enough to buy it.