I've tried pretty much all the Pho places in Richmond, and Pho 78's come out on top as the best. It's pretty much on par with Pho Lan, which has excellent pho as well, but the ambiance and location of Pho Lan is extremely poor.
The soup base was excellent, and the noodles were al dente. The beef (I ordered the #11, which was rare beef & fatty flank) was very tender, reminiscent of the famous butter beef at Phnom Penh in Chinatown. Surprisingly, there was not much MSG used in the soup; I finished the whole bowl of soup and didn't find myself dying of thirst hours later.
Service was excellent. It seems like it's run completely by the chef and the chef's son -- with the son managing the customer's side of things.
It's a tad expensive for pho ($7 for a large bowl), but keep in mind that you get a serving of spring rolls for every large bowl. For a party of four, that's four rolls! The spring rolls themselves were very good, except they use chinese spring roll wraps in place of the old school vietnamese rice rolls. If they used rice roll wrapping instead, it'd be pretty much perfect. This is purely subjective, though. The filling was awesome.
We were initially reluctant to sit down at Pho 78 as it was pretty empty on a Saturday night, but we're very glad we decided to try it out.