The reason I bought this was for the fully square ruled base.
However, the build quality is really poor.
The base is very light weight and slides about when in use.
The blade is also too flimsy and twists as it gets further down the cut. I wanted to be able to cut full length on A3 paper but the blade tears the last 1/4 of the cut or folds the paper down and doesn't cut at all.
It's low cost and that is reflected in the quality. I sent it back.
Unfortunately it is not cutting properly. If i need to cut an A3 size sheet it cuts only in half way.Other side is just bending. Aswell blade is not going up enough high in one edge which make difficult paper insertion.