I Bought a computer from them last October.
The service was excellent apart from them sending a delivery confirmation e-mail accidently one day too early.
The computer came with no power lead (the norm for the £500 core 2 duo windows xp computer) however they were excellent and sent me one in the post within 2-3 days.
The service was excellent and computer was delivered within 14 days (this was in a high order period though, I was informed of this on the website in advance)
delivery itself arrived at 9:10am in the morning on the given day,perfect for me
excellent software bundle nero and power dvd
xp disk included as well as manuals and drivers
only downside to pcnextday is they use ECS motherboards. This means that you can only use 533mhz DDR2 Ram as opposed to 800mhz ram.
This is only a problem for techies or enthusiasts