Aberjack is proving successful in the USA. Last night I researched his get who have registered with him as sire with the USEF.
He started breeding in 2002, so his oldest are 8. He has probably 20 registered, and eight have FEI passports, which means they are going Prelim or above. Those eight are all with pros and are coming along quite nicely–2 have done 3*s. All of the horses that have the passports competed in 2010.
Gillian Clissold has a homebred bred from Sportscar that she’s bringing along. Laine Ashker has a homebred that she’s bringing along. Buck Davidson is riding one, and DOC was riding one prelim early last year. Lauren Kieffer has developed two and still has one who has been winning with her. The other was sold to a YR and has been competed by Mike Huber and Heather Morris after the AECs this year. The others with FEI passports seem to have been or are being pro ridden.
I’d say of the current US eventing stallions, Aberjack is probably the most prolific and the most proven. What I don’t know (because I didn’t do a results search on all his get) is whether he produces rides for pros as a general rule. But if I wanted a US stallion for eventing, I’d look very closely at him.
Almost all of the USEF registered Aberjacks are from 2002 to 2004, but maybe people wait until they are competing USEF level to actually register.
Aberjack is one of Mark Todd’s former rides and is 7/8ths TB, IIRC. According to something that I found on the Internet, which may or may not be correct, he’s Oldenburg approved, but they don’t say which one.