Clutch Judder is common as you all said when the Fly wheel is not scimmed correctly but it can also become apparrent when the Clutch starts to go. Its basically an indication that the two surfaces are not contacting correctly.
im not sure of your leggy, it should be only 20-30 euro to sceam a flywheel but some lads dont as your have to send it off to an engineers and will taken afew hours
Scooby 555's mate did mine in the typeRA when I was doing the Clutch and it didn't have any Judder so give him a PM and I'm sure he'll give you his mates number. I'd say the legacy clutch is simular to that of the Impreza.