Butland will return to the Potteries in the summer.
"The spell has had a few ups and downs, but what hasn't changed is the experience I'm getting of playing for a big club," he told The Sentinel.
"There's a lot of expectation that comes with playing in front of big crowds.
"Yes it's been tough and we haven't picked up enough points, but it's taught me a lot and it will help me moving forward."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball