[dpapathanasiou]

My projects are mostly based on features that are missing or misimplemented in the existing products.

Actually, that's not too far off from a suggestion Paul Graham made at the first Startup School a few years ago, in his "Ideas for Startups" speech (http://paulgraham.com/ideas.html):

One way to make something people want is to look at stuff people use now that's broken.

There's a big difference, though, between missing or misimplemented and broken.

If it's misimplemented, but basically does what I need it to do, then I'm not as open to an alternative.

If it's broken, then I'll seek out another product or a third-party plugin.