I think that remains true. The Bell helmets I tried were round, the Giro helmets oval.
Interesting comment. I started with the old Bell Biker and stayed with Bell until about 10 years ago, when I found that the Giro Xen fits my roundish head perfectly. I suspect the other Giro models are, as you note, better for those with a more oval head shape.
Now I have to mount a mirror on the helmet. My roadie friends don't use them, I always do, and looks be damned.
I started using a helmet-mounted CycleAware mirror about 15 years ago and now hate to ride without one. I carved a notch in the left side of the visor of my Giro Xen, and I have had to replace the mirror's adhesive pad once, but otherwise, no issues. I have morphed into one of those obnoxious mirror evangelists. (I have also noted, on the few group rides that I have taken, that the older guys are the ones who tend to wear the mirrors. Maybe we have learned something over the years?)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069