What do you guys think of this close up lens? The leica Elpro VIIA
http://www.ebay.co.uk/itm/LEICA-LEITZ-ELPRO-VII-A-NAHLINSE-CLOSE-UP-LENS-S-VII-4-11-/390373702637?pt=LH_DefaultDomain_77&hash=item5ae415fbed
http://fuzzcraft.com/achromats.html
This site have only listed up to Elpro4. I was if any one has used one of these before and know how good they are?