This is similar to what my coach was having me do this summer and I think it took me a better part of 2 months to get used to but it was the few good shots where I could see what it was going to lead to that kept me working at it. Its not an easy change since it is uncomfortable and you are used to the original swing but the consistency will be worth it.
One thing I was fighting with this swing is my natural move through the ball is somewhat 'handsy' and I struggled with keeping my wrists locked down through the ball. I think the consistency of Matt Kuchar has made this flatter swing more attractive to a lot of players, but it is hard to do, at least for me it is.