They've done fine for me with both issuing and reissuing AONE5s.

I've had an EMECO issued AONE5 reissued by AA twice, once at the NYC Park Avenue CTO and once at the ticket counter at Bradley Airport in Hartford. Both were somewhat time consuming (mostly due to tax calcs), but ultimately successful. Before having BDL do the reissue this last time, I contacted EMECO via e-mail askign them to reissue and they were happy to do so. Problem was that I thought there would not be enough time to send the ticket to CAI and get it back.

Bottom line, in the past year, EMECO has gotten very good and very experienced at issuing XONEX tix. I would not hesitate to use them.