yes, the speakers went in both front and back, and i screwed them straight in, as the plastic frame looked fairly solid. sound is "greatly" improved as the magnets on the speakers are huge for the speakers size. The plastic and seats in the rear of the car are an offputting thought when you have to remove it all to get to the speakers, but it is well worth it.
59 quid is an excellent price as i paid just over 100 for a pair from sextons, but i cant say that i looked around for a price.
I think they are the most powerful speakers for their size on the market, i think JBL do something 10W more but they are 2-way not 3-way and i dont think they have an integrated tweeter.
It is worth getting the most powerful you can find, because when they are that small, you need to crank the volume up to get some decent sound!!
I dont know what the original head unit is like (is it 4x35W???) but ive got a clarion 4x50W installed for good measure.
If anyone knows of any better speakers than the pioneer ones please post your info here!.