I fish both spey and conventional fly gear, as well as plenty of conventional gear. Spey rods are great for certain kinds of water: water that you are intending to cover with a standard wet fly swing without retrieving the fly. For this water, they let you cover the water more easily than a standard rod.

For small water, and short, dunky sorts of casts, they are more trouble than they are worth.

I took a 7 wgt spey rod with me to alaska this year, and did well with it on big 'bows. It was great for reaching the middle of the river from stretches where you had brush at your back.
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