EVERYTHING!
Never used the same product twice.
Started off with twin bladed carts, then moved onwards and upwards as the multi bladed versions came out. 'Lubrastrips', and little wires that went over the blades. 'Lubrastrips' with stripes and aloe vera in. And vibrating handles.
I used a Phillips coolskin electric for a while. You had to buy little sachets of watery nivea cream to put in that.
Noxema canned foam (menthol) was the best of a bad bunch. All the canned gels were much the same, as are all of the King of Shaves shaving gels. Only colour and scent changes. It might say "Ultimate Kinetic Silicone Vitamin Enriched Turbo Charged Formula!" on the pack. But "Cold and Slippy" is what it is.
I had ok shaves with most of the stuff, apart from the electric which was downright painful, and used to rip the face off of me on a daily basis.
I still rarely buy the same product twice in a row. But for different reasons now. Before, I was looking for better. Now (largely thanks to these darned forums) I'm like a kid in a sweet shop. Lots of good stuff to try, but only one face to shave.