Love these dance sneakers.  I do line dancing and rock n roll in them and they are excellent. They slide beautifully but not so much that you go zooming off the floor! They also look good.  Split sole is not a problem for me.  I tried them on at the shop first for correct size.  Left foot perfect, Right foot is a little small - toe is touchng end of the shoe, as my right foot is slightly bigger but as they are soft I'm thinking they'll stretch slightly.  I normally take a size 7AU/7-1/2US street size or 8-1/2 in my Adidas or Reebok trainers.  You need to go up 1-1/2 - 2 sizes from street size.  I got the 9.  I have quite narrow feet and they're not too wide.  The bloch website is accurate with the sizing charts.