Now it's funny you should ask that. Because I bought one of those tiered electric steamers years ago, used it a couple of times and never really got the hang of timings.
But recently, in the last Tesco vouchers offer where you could collect Pyrex, I got the casserole with steamer top that you can place on the hob and I LOVE it! I can get 3 different veggies in it, saving on hob space and the veg is nice and "al dente" with a lovely colour to it.
ariadne xx