Not bad. And you might save weight by using very light spectra cord. Also, no danger of accidentally letting the poles snap together, thus doing damage to the end of a carbon tube.
But I've never had shock cord fail on me in the field. Probably because my poles are built to allow easy field repair - so it is no problem replacing the shock cord every couple of years or so at home. I did buy an old model Helsport Stetind 1 where the shock cord had already lost most of its elasticity and had to be replaced. Sold the tent before ever using it.
I use the 3/32" cord, with enough tension just to firmly hold the poles together. As they are field repairable, it would be easy to tighten the cord in the field if it starts to lose tension, but have never had to do that.
By field reparable, I mean leaving the insert at one end of the pole unglued, just a good press fit, but easily removable with a mini-plier.