I've done it with my 500 mount on a short barfly and long (double) barfly. Didn't find either of them very comfortable. I started interlacing my hands (which I do on aerobars too) and lifting my hands up a bit towards my face. I've also gravitated to putting my forearms a bit further up on the bars so I have more arm out over the front wheel. Seems to be pretty fast and getting better every time I've been using it.

I imagine a bigger computer (1000 and elemnt) might be better, but I still prefer to have more arms out there as it feels like that narrows my shoulders more.