273 days ago(+3)
A little advice. Enter the tower when your maximum achieved zone is at least 30-50 levels higher than the requirements for the first floor of the tower.
225 days ago(+2)
You're a lot farther along than I am (I left my 'time machine' back in Trimps) , but at the 'just recently unlocked towers' point I wouldn't advocate waiting that long.
Even a few of a new type of heirloom make a massive difference, and there are some to be found in the towers. Add in the mild bonus of the low hanging attack/health crown-bought boosts, and I think it makes sense to burn a few keys pretty quickly.
225 days ago(+1)
I think once out of curiosity everyone will launch the tower as soon as they get access to it :) I meant not to waste the keys going through 10-20 levels of the tower. After all, the main bonuses in them are every 50th level.