Fantastic!

Great app. Easy to use. Playing against Shredder is always fun because the app will adjust the playing strength after each game according to your performance. The puzzles are fun and challenging and I found myself spotting tactics much easier after doing the puzzles for a couple minutes a day. Its rewarding to see your playing strength rise over time as the app will graph out your ELO rating from the games you play against Shredder. Great people that are very quick with customer support. Highly recommended. Go buy it!

TheSwoop about Shredder Chess