Having just got back into some winemaking after an initial couple of batches back in the 80's, the wife and I bought a Portugese floor corker right off the bat. Our first bottling was lower priced wine kit that came with corks and we used those corks. We recently bottled a batch from last fall's grape harvest and I bought premium natural corks for those. The premium corks bottled much smoother than the cheaper ones that came with the kit. With the kit corks, I had some shavings off several of the corks, larger dimples in the top of the cork immediately following corking, and they did not seem to seat as easily/fluidly as the more expensive corks. I had no leaks with either.
Bernie
Bernie