sorry, i have qualified this before on the forum but to summarise, 
  
they fitted a flat tyre to the 5 series bmw, then used two rings of weights to offset it, stop a second and think about that, have you ever seen an alloy with 2 whole rings of counter weights! 
  
they then refused liability that the tyre shredded itself when i drove it, 
  
then argued with the place i got to rectify it suggesting i wouldnt get a refund. 
  
managed to get one in the end but i would never use them again even if they paid me, 
  
as others have said, the only thing between you and the road, once bitten etc... 
  
just a big bag of clunge their whole company...