Which IPhone barcode reader [closed]

There are many barcode readers available for IPhone development. I intend to write an app that uses a barcode reader.

VSBarcodeReader

Commerical license. Support all iPhones

Pic2shop

Free license. Support all iPhones

ZBar

Free license. Supports 3GS & 4G

zxing

Free license. Support all iPhones

ShopSavvy

Commerical & ad supported license.

Red Laser

Commerical license. Supports 3, 3GS & 4G

Has anyone experimented with several of the above readers? Is one more reliable than another? Easier to use? Are the commercial ones more stable? Which one would you recommend or avoid?

Please only answer if you have used several different barcode readers.