Prime Critical Archery Feat

Anybody tested this in depth? I've done a little on my own (see below for results) and it seems to work like it's described, but the question I ask is whether or not the feat creates a noticeable increase in overall dps and is worth taking or if it's just a fluff skill that is better left untouched in favor of other more beneficial skills. Also I'm far from what you'd call a math major, so if anybody is willing to do the work calculating out any extra dps that could be attained here that would go a long way to proving the point in either direction.

Personal tests results:

Conditions
- Unless stated all skills were "recharged" with the Prime Critical feat activated via Split Shot. Three Target Dummies were utilized in each event.
- Critical rate is 30.5% with Correcting Aim at 5/5. The aim of this test is obviously to create as many critical hits as possible, so I've left Correcting Aim active to further assist in that goal.
- For consistency all recharge times listed below were captured via the assistance of a personal stop watch activated and deactivated by me in sync with the recharge timer shown on my skill bar.
- All tests were repeated 10 times to account for human error and the low/high range listed

Rain of Arrows
Regular Recharge - 17 seconds
Corrected Recharge - 14-15 seconds
Corrected Recharge (Used on target, no assistance from Split Shot) - 15-16 seconds

Split the Sky
Regular Recharge - 21 seconds
Corrected Recharge - 17-19 seconds

Thorn Ward
Regular Recharge - 21 seconds
Corrected Recharge - 17-19 seconds
Corrected Recharge (Used on target, no assistance from Split Shot) - 21 seconds