First of all, the mighty and undestroyable Tryndamere.
If u want to play a good Tryndamere, take the build and have fun.
His crit and attackspeed get very high by the two zeal�´s and the Berserker's Greaves.
First of all you need to buy the Brawler's Gloves to get a higher crit chance.
Furthermore, u will buy Berserker's Greaves as your second item, to increase your attackspeed.
If you got enough money build your first Zeal after taht a second Zeal, yout attackdamage and your attack speed is now high enough to deal great damage on your enemies.
Now, you got enough kills (hopefully) to get your Infinite Edge, after that its great to kill other Champs.Yet,update your Zeal�´s to Phantom Dancers. If u reach the Endgame you suppose to get The Bloodthirster, you have big life leech and deal tons of damage.At least, your enemies will hate you for this build.

Pros
Brutal Damage
Easy Gameplay
Good skill to get away of fights
Ulti is usefull to get kill´s at tower and in Teamfights

Cons

Low life
Early game freekill
team with stuns will suck

Use your summonder spells often to get kills, otherwise you get not enough money.
Exaust and Ignite are always good for geting a fast early game kill.