Yep.. he's full of shit. My V35 has been extremely reliable engine-wise. Has not missed a beat since owning it..
Interior from factory i think is pretty basic, but keep in mind they are a 10 year old car.. but i do love my leather
Gearbox, he is sort of correct. At least in the 03-05 models with the CD001. I have upgraded to the CD009 which is standard in the 06-07 and has stronger synchro's and it's amazing. The early model gearboxes are known to have 3rd and 5th synchro issues, i had lost 5th synchro by 80,000km..
My V35 is also for sale if you'd consider it here's the advert http://www.carsales.com.au/private/details/nissan-skyline-2003-14924322?base=1216&vertical=Car&cr=3&eapi=2&__N=1246%201252%201247%201282%201216%201622&num=15&silo=Stock&Range=Price%3a15000%2c20000~0.5&items=%5bMake%3aNISSAN%2cModel%3aSKYLINE%2cBaseEnabledBadge%3a350GT%5d&sort=default