While I've never used it, the undeconate ester has been around for a while.
This will never work for body builders for the following reason:
1) Test undeconate breaks down to only a 63% ratio of test to ester. So 100mg of test undeconate only contains 63mg testosterone.
2) Even tho you only need to inject it once every 10 days or so, your going to end up injecting more frequently anyway because you'll want to inject more than 3cc's every 10 days.
3) This ester will remain detectable in the bloodstream for a LONG time
4) Body builders want a drug that gets in and out of their system quickly.
Something interesting to note: Once every 3 months will work for HRT, but not bodybuilding. For HRT even sust is only shot once a month.
RIP BigJim33 & GearedUp: You are sorely missed my friends.
Hindsight is always 20/20. But looking back it's still a bit fuzzy.