Sorry to resurrect and old topic but for me its quite current, so I thought I'd post my experiences.
I have 2007 Octavia vRS 2.0TFSI and the car currently has about 58k miles on the clock. I wanted to carry out some self maintenance and bought new coils and plugs from Awesome. The car had original Bosch plugs and coils and its been fitted with a stage 2 tune. My problem with the car has always been that every now and then the car has some trouble starting when its cold, so I figured that it must be the plugs. I've read quite a few topics about this and realized that cold starts is pretty a common issue for the TFSI engine. Therefore, changed the coil packs and the plugs and now it does it almost every single time. So, based on this I probably will be changing the plugs to either 7's or maybe even 6's. The problem is pretty much the same what gigolo456 had on the previous page.