Buy recommendation! (With limitation)

Since buying mid April 2013 I have now used four of the five cartridges in my printer and am so far very satisfied. Only the yellow is still intact here.
There are the right five cartridges per carton, all in each case again, just like the original, packaged in a semi-transparent and sealed envelope.

All exchanged cartridges were detected without difficulty from the printer, I did not get dirty fingers when changing and so far the printer runs so flawlessly.
Photo printing I have not yet done so, in color on plain paper, everything looks good.

I have used this Geha package for the first time and will order it due to the low price probably more often.
In the past I had in addition to the expensive original ink cartridges from Canon uses the replicas that exist in Germany's second largest disc Outer from time to time in the offer. These are priced about the same with this brand product from Geha, but not regularly available, or if so, then sell out very quickly.
Furthermore, these Czech replicas from discounters have always wanted rumgezickt again, as they were in between suddenly no longer recognized and only again off and had to be reinstalled. Of course, each time with renewed "Ink friendly" automatic printer-flush, as it is caused by each cartridge change the MP 640.

Addendum on 27/05/2013: Unfortunately, my euphoria was somewhat premature. Once again the large black ink cartridge is not detected. After installing everything is fine, Dan comes the inevitable and ink-feeding, automatic setup of the cartridge while coming back the indication that it is not recognized.

With the colorful Geha replicas I had the problem so far.
Hence my strong buy recommendation, but I hereby restricts.