How reliable is LTE as a home office solution?

I had a Telkom rep at my house just now showing me the speed I can get with LTE.

They brought a router and just plugged it in, and without any adjustment, I got +- 45mbps down and 7mbps up to a local speedtest server.

I am very tempted to move over to them, but obviously for a competitive price I will have to sign myself into a 2 year contract.

I work from home and need a reliable internet experience. Does the LTE service provide this, or is it finicky?