Am not a hardcore slot player but just a recreational one so I was spinning manually to enjoy the game and the contest I was taking part in, autospin feature takes out all the fun, when the three free spin symbols came out : sat back and enjoyed the show and have to admit it was really fun.

As Bitinity ( aka slot master  ) just pointed out Stack'em is a high volatility game  you can drain your balance pretty quickly by playing it but with a bit of luck some big reward is right behind the corner.