QR Codes for www.blockeddrainsbirmingham.co.uk

Hi all QR codes ? How many people use these codes ? i have in the past not to find anything just to find out what they are ? since i found out what they are MZR Plumbing & Drainage has a QR code [caption id="attachment_70" align="alignnone" width="200" caption="QR code MZR Plumbing & Drainage"] 
Is this worth having on blogs and stuff can you all provide feed back on this thx