I've used 1388 for seven batches, and it has proven to be a strong fermenter without a starter. The last batch had full krausen with foam streaming out the blow-off tube in about 12 hrs, and all previous batches were about the same.
However, after my last brew day, in which I used a starter for 1762 (Belgian Abbey Yeast II), I will now make a starter with all future batches.
Primary:Blonde Ale III
Secondary:Strong Golden III
Bottled:Trippel Ale, Dubbel Ale, Saison, Belgian Blonde, Belgian Strong Golden, Belgian Orange, Belgian Ardennes, Trappist Ale, Belgian Strong Golden II, Belgian Blonde II, Belgian Orange II, Dubbel Ale II
On Deck:Belgian Orange III