The site transfere from Ubercart to Woocommerce went very well. I ended up using cart2cart and I did the transfere. Once the two sites were set up to make the transfere as per there instructions it was easy. I transfered 100 products over 2000 customers and over 2500 transactions. Everything transfered over including SKU, description weight etc The only issue I had was with some of the images. They could have done it for me, but so many needed updating anyway, I decided to manually update once the transfere had been made.
I also was able to transfere a second time a few weeks later when I launched the new site and wanted to make sure I had all the latest customers, sales etc.
Cost was around $160.00 which was a deal in comparison to the man ours it would take to manually transfere the info over. If you go to the cart2cart website it will calculate and give you an estimate based on how many products customers etc.
Woo commerce is great, free but expect to spend some cash adding in the plugins you will need to really get the most out of it.
Good luck with it all!