I had my second round implanted earlier this month. The first round of 10:
1 month 907
3 month 775
4 month 530
5 month 525
6 month 319
Essentially nothing really left at 6 months out. The first time I had it done I had some pain and bruising last about 2 weeks. This time the doctor did 2 smaller tracks instead of one long track. He did them in a V shape, so just one incision, just two short tracks. Much less discomfort this time, pain about 3 days, bruising gone in a week. A big improvement over the first time.
I got 11 pellets this time, will see the one month level next week. Also considering 8 pellets every 4 months.
Did 200mg shots every 10 days prior to the pellets. At the end of 10 days levels were usually 440-450 (tested before getting next injection). It was too much of a yoyo for me. I would feel great for 5 days, and not so good the next 5. The pellets worked great, very steady absorption for me, the gradual decline was not as noticeable. I suppose they dissolve at different rates in different people hence the big fluctuation in results mentioned.
I my case I feel really good with a level over 600, so the consideration of every 4 months instead of every 6. The first round really dragged the last month. So probably 4-5 months best in my case.