After riding trials for 2 years in a pre-90s Arai, I ordered a TRR from DritBikeExpress in UK thru Ebay. Major saving over price quoted by a State side trials shop. Firgured E-bay would take some risk out of sending money overseas. Took almost 2 weeks to receive.
I have a "long oval" shape head, no issues with the shape of the TRR. The TRR is more oval than an Arai XD3.
I wear XXL in all but one of my helmets. After research and refering to the size chart I got a XL in the TRR and it's a little snug. The liner padding is thicker than most helmets and should compress some with use. Still for the price I did not want it uncomfortably tight. So, for less than the cost to ship it back to UK I ordered the XXL liner to try.
Love the quick release strap, this will make taking off my helmet to scout a section an option now. I really had issue with getting too hot in my old Arai.