I have tried ,radium 20k, coralvue , reeflux 12k,hamilton 14k , xm 20 k 's . They tend to shift around the 9 to 10th months of use . I could swear the 12k reeflux didn't give me 6 months of good service . I do like the look of the Hamilton 14 k and the xm 20 k over the others . I prefer that...