Russell,
I also use a promaster for my film body. A flash that uses AA batteries is considered advantageous, as the worldwide availablity is an issue for those who travel. The cycle times quoted above seem excessive to me. With fresh batteries, capabilities should be nearly immediate. Wedding photographers, typically have requirements for flash photos, and I'm certain that they cannot afford 8 second recharge times. You may check with some local fotog's to see what battery packs they use.
I don't recall ever waiting more that a second for the flash to ready itself for the next picture. The sony model displayed in your post looks sound and appropriate. If it takes AA's, go for it.
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