I got a inconel AR system on my bike when I bought it used last year, and have been very happy with it coupled with a Rapid Bike Evo, and I have not had any problems with the system or when i have posed questions to AR regarding the system and some details regarding it. I like the look of it on the bike and with DB killers inserted I also like the sound, but those points are just my opinion 
But if you have read the threads on here regarding it, there have been a few too many who have had problems with the system and the metalwork, compared to what you would expect and compared to the problem rate mentioned with Termi/Akra systems. I saw this thread on a UK Duc board with someone who noticed large cracks in their AR system:
1199 - Cracked Exhaust - Anyone Had This Happen? | Ducati Forum
He hasn't posted a followup, so I don't know if he has gotten any customer support on the cracked system, but "caveat emptor" should apply here If you read the threads here you can at least say you have material enough to make an informed decision about it
But if you have read the threads on here regarding it, there have been a few too many who have had problems with the system and the metalwork, compared to what you would expect and compared to the problem rate mentioned with Termi/Akra systems. I saw this thread on a UK Duc board with someone who noticed large cracks in their AR system:
1199 - Cracked Exhaust - Anyone Had This Happen? | Ducati Forum
He hasn't posted a followup, so I don't know if he has gotten any customer support on the cracked system, but "caveat emptor" should apply here
If you read the threads here you can at least say you have material enough to make an informed decision about it 
