They do have some nice bass.
I like the bass I get from my '67 Orange Globes and '61 BB Straight Man pair, but my new pair of late '50s D getter BB SMs I'm burning in are less than impressive on the low end. In a word, they're weak. Granted, I've only put 25 hours or so on them, but I don't think they're truly NOS. Maybe they'll open up, but compared to almost every other pair I own, these roll off way too much down low. Respectable on the mids/upper mids/highs, however. Overall a bit of a let down. I mean, even my airy '66 RTC E188CCs have more impact in lower reaches. So, the burn-in continues.
The '68 Tesla E88CCs I got recently have fantastic bass, and are no slouches in the full range.
And as I write this, I'm tempted to kick the D getter BBs to the curb and give the '60s Reflectors their turn. Decisions decisions