Borderposts are an Underused Resource

So,

I've been building a 5 colour Urtet artifact deck, and during my research, I've found these beautiful little gems called Borderposts. You've got one for every colour combo, and act as a bounce land for a basic. I can see the possibility for a very quick ramp using these, but are virtually ignored by any precon I've seen.

I really don't see a downside by using these in any future deck.

What are your thoughts on the Borderpost?