https://evisa.xuatnhapcanh.gov.vn/trang-chu-ttdt

In 2013, I went to the consulate in SF (probably where you would go if you went in person). It was easy, just a hassle coming from the East Bay and then going back again to pick it (my passport) up. The only advantage is that you get a nice sticker in your passport as a keepsake. If the Vietnam e-visa is like other e-visas that I've obtained, it's just a piece of paper that you print out.