The tile looks nice but it just isn't as durable as porcelain. I've dropped my 20oz hammer on my kitchen floor and the tile didn't even chip. Another concern is the existing concrete floor. Is it 100% moisture free? Is it going to settle? You should be able to get a porcelain tile at the depot for around $2.00 a square foot, if not less. Try to consider the membrane anyway...
Schluter-DITRA - Schluter-Systems
Good luck and let's see pictures!