Opinions - Scaling CDR Runes in the Jungle

A while back, I noticed Trick2G using Scaling CDR Quints and Glyphs on Udyr in the jungle during one of his games. Since I had the runes anyways, I played a few games using them to experiment and I found myself enjoying them immensely. Following this, I began trying them on some of my other junglers (i.e. Shyvana, Volibear, Xin Zhao, Gragas, Sejuani) to similar results.

While they are less efficient during your initial clear than some alternatives, I believe the main reason I enjoyed them was that I no longer had to itemize for CDR. While most of the champions I listed above work quite well with CDR, it can be difficult to acquire in any significant quantities without sacrificing a significant amount of durability or damage. However, it is quite easy to get 10% CDR during a normal build (i.e. Trinity Force on Udyr, Spirit Visage on the champions listed above) without having to adjust your build-path or make suboptimal choices.

While I may lose out on mana (since I would usually take Frozen Heart or Iceborn Gauntlet on my bruisers/tanks for CDR), Hunter's Potion seems to be a sufficient source of mana sustain for 250G (since I started with Refillable Flask anyways).

Basically, I was wondering what people think about using Scaling CDR Quints and Glyphs on junglers and if anybody else has found success with them (or may be trying them in the future).

Opinions?