As to the reputation of audio cubes, rest assured. I ordered my W-1000's from them. I also am leary of all internet transactions, particulary ones who claim to ship "unavailable" product from overseas. However, they are a sponsor of Head-fi, and speaking as a customer, I have nothing but praise for them. My W-1000's were tracked, I was notified of their shipment, and received them promply. They were perfect, double boxed.
I don't know how good those headphones are, there are plenty of comments in head-fi for the A-900's. But I LOVE my w-1000's.
If it is a question of ordering from an unknown supplier, then feel comfortable. Price-wise, that's another question, I however had no problem paying their asking price, and was rewarded with prompt and careful shipment.