It depends, what your enemies are.
I revived one of my accounts to get some experience battleling the spire, and there is a very important sidenote. this is my experience
- If you are going to battle in the game vanilla, you get smacked in the face hard.
- You will need some 2/3* units to make it work. lets say ~Wizards and Dragons chapter.
- If you add a fire bird, 1 UUU, 1 LR and 1 MM 95% of the battles are a breeze and very easy to do, it's a completely different spire.
I think this is very important to mention that yes batteling the spire is very easy IF you use a repetable but fair amount of combat buildings. and if you do not all this easy fighting people speak about once you try it it's a total nightmare that will stop most people from even trying again.
I mean you get some nasty autolosses in the second map already and you'll get really hammered big time.