What is the experience of flash recharging speed?
I just ran a test with both my EF-20 and my EF-X20. Both ran on recently charged low self-discharge batteries (Sanyon Eneloop technology knock-offs).
I operated the EF-20 off-camera and popped a test shot (I suppose this is a full-power flash pulse). I used the EF-X20 off-camera as well and set it to manual operation in two power settings - 1:1 (full power) and 1:64 (minimum power).
I took two recharge times for both flash units - (1) flash pulse to blinking power light (ready for another min. power flash pulse) and (2) flash pulse to continuously lit power light (ready for another full-power flash pulse).
flash pulse to blinking light - 6s
flash pulse to continuous light - 9s
1/64 power, flash pulse to blinking light - 10s
1/64 power, flash pulse to continuous light - 21s
1/1 power, flash pulse to blinking light - 11s
1/1 power, flash pulse to continuous light - 21s
Timing measurement accuracy ~ +/-0.5s
So, the EF-20 is definitely faster. The recycle time of the EF-X20 apparently is independent of the amount of capacitor charge used for the flash pulse. Please note that the EF-20 runs on AA size batteries whereas the EF-X20 is using AAA batteries.
BTW, you can find more info about general aspects of using Fuji flash units in the