I replaced a rear Technoflex with a WP one, to be honest I suspect they are both made by the same company, the springs are interchangable and the shock bodies are identical except for the damping adjuster, WP is plastic and Technoflex Aluminium, both are made in Holland.
I pulled mine apart to see whats inside, A bit dissapointing but they are one of the cheaper after market shocks and probably no worse than any of the others. The damping was much better than my WP.