I have used it (We have a similar SEO Tools Suite and I regularly check Link-assistant and other SEO tools suite for competitor analysis).
You may find my suggestion biased (As I am associated with one another All-in-one SEO tools suite), but here is what I think.
Link Assistant was designed to make link building easier but it was originally designed to get links from links pages, link exchanges etc.
The truth is that SEO is continuing to evolve and because of this, there are some features you may not want to use. This is where you may get disappointed with it.
That said, LinkAssistant is still a very helpful tool when used correctly.
If you are open to explore other tools, have a look at SERPed.net (shameless plugin)
You can use it to identify blogs to reach out to (for guest posting for example), key metrics (like DA, PA, Moz Rank, CF, TF, Link age) to know the quality of the backlinks and then keep track of the links you have earned/acquired.