I'm also a table sugar user for priming. I started out with corn sugar (because that's what came with the first kits I ever bought), and then switched to table sugar because it's cheaper and easily accessible.
I've never used the tablets because in my opinion, it's an extra expense that I can avoid. I honestly don't know much about them.
I recently had a couple beers from a fellow HBT user that uses DME to prime his bottles. I'm not sure I noticed a flavor difference (it's hard to tell unless I had two of the same exact beers side by side, one primed with DME and one primed with table sugar), but I do
think the carbonation seemed "softer" with the DME.