but do they need greasing? Just got given a load and not entirely sure what I'm supposed to do with them.

You dont need to grease them. We have had a set for a few years and the good thing about them is that everything slips out nicely. However we havnt used them for baking for some while now as we find metal baking tins cook cakes and pastry far better.Silicone is great when your making cold set desserts etc. Im sure other people will have differing opinions.

Brilliant for coking lasagnes and roasting potatoes in

I had some silicone muffin cases and I used to grease them slightly - because the muffins did stick in bits.

Probably a stupid question but is there a particular advantage or benefit to making lasagne in one? Just cause I make them often enough that, if so, it might be worth investing in one.

Far easier to get a piece out of the silicon tray as the sides 'move'. And if you don't eat the whole lot in one sitting, you can turn it out in one smooth move.

We've just had a "cull" of our kitchen baking implements lurking in our base cupboards.
I kept the basic baking tins and sent the silicones to the charity shop.
They never really convinced me.

Yes call me old fashioned but they have never appealed to me for baking cakes etc.
I would be surprised if they cooked pastry well.But I've seen people buying them so what do I know?

Personally, I'd grease if it was a cake. If it was a something more sturdy, like a lasagne or terrine, I wouldn't.

I've used silicone bakeware and noticed it taints the food with a plastic taste. Wasn't cheap stuff either. Also, those silicone egg poachers - rubbish unless greased. They went in the bin.

I've had mixed results with silicon bakeware. For mini cakes usually ok anything bigger less successful. I now either grease Ior line the tins when I'm baking as had too many cakes stick and turn into disasters because of it. Looking to invest in better tins especially for doing full size cakes and for smaller cakes usually put cake cases in to be on the safe side now.

I've got a silicon square baking tray which I use for microwave flapjacks. It doesn't really need greasing, but I do brush a bit of melted butter over it. One of the ingredients is melted butter, so it's there.

Was given a round cake pan as a present, used it 4 times didn't grease it first time (as recommended) and it stuck, next 3 times I did grease it and still it stuck ! Also found I couldn't get the cake to rise as it does in a metal pan so went back to the metal one and the silicone pan makes a bright colourful fruit bowl.