if your on TRT for life, being on the high end may come with longer term risk factors. I feel great at 1500+ but, long term your gonna possibly have RBC and blood thickening issues, cardiovascular issues, prostate issues, etc.. docs generally, from what I know, prefer mid range levels (600 or so). also, I've read that guys who have high levels of testosterone live on average 6 years LESS then guys with testosterone levels on the lower end of the scale. point being, having consistently high levels of test for the long haul may not be healthy, even though it feels great in the short term.