I had the implant twice and it worked fine for me - very light very infrequent periods and not too many other side effects. I also got on fine with the combined pill but now can't take that as I have had a migraine with an aura.
However, when I stopped hormonal contraception it took about 18 months and some fertility drugs (Clomid) in order to conceive my son, so my fertility clearly isn't normal. I'm now steering clear of hormonal contraception in case we decide we want a second child, but if we decide not to for whatever reason, I'd happily go back on the implant or get a Mirena.