Mine arrived on Friday night. I ordered some from HK earlier in the week and they arrived in record time, unlike the no brand ones from Poland these worked with my EF/EF-S lens without any issues. Personally I am using them to increase magnification for the Macrophotography that I do. Some light is lost as to be expected, so I use live mode with 5/10x zoom on for focusing and use an external Di622 flash for lighting until I can pluck up the courage to spend out on a proper macro flash with a MP-E 65mm.
DCR-250 and DCR-150 are also other filters to consider if looking to zoom in with telephoto lenes.