I test drove the A45, 8V S3 and 135i back to back as potential replacements for my 8P S3. The 135i was the best to drive, cheapest PCP, but ultimately little bit too cramped to be my daily family car. Very tempting though. The A45 was brilliant, pretty hardcore, but the PCP deal was silly as the residuals were awful, APR high, discounts low. The S3 was also excellent but also expensive as a PCP proposition. On balance, and as a daily then I would have probably gone for the S3. If the Merc was closer to the S3 price wise (it should be IMO) then that would be different. Ultimately ended up with none of the above.