I have bought the store candi sugar and inverted my own for a couple of belgians I brewed. I can honestly say the one I bought from the store was a bit better tasting. I added the sugar to both of them in the primary during the height of fermentation.
But, the fact that they were two different types of beerr and the fact that I didn't fully solidify my inverted sugar would not make an good comparison. The inverted beer turned out a bit sweet at the end.
I would agree with people in this thread that say to just invert your own sugar. It's pretty easy and I plan on doing it again when I do another belgian. Saving a bit of money on ingredients is a good thing.
