I've got STI shifters (Campy Chorus and DuraAce) on two of my bikes, but my commuter has DA downtube shifters. I installed the DT shifters on my commuter mainly to save money, but after riding it a while decided that I actually like them better for riding in traffic. I'm not exactly sure why, but I think it's got to do with the slower pace, riding solo, and not shifting as often.

I've tried riding my commuter bike in group rides and it's not as enjoyable unless it's a leisurely pace. It's harder keeping up with a paceline on hilly terrain when you have to reach down to shift. STI shifters are definitely better in that respect. But for a leisurely pace and/or a ride on relatively flat terrain, I actually prefer the DT shifters.

I've never used barcon shifters, and might like them if I tried them. I just don't like the fact that the Bleriot doesn't give you the option of using DT shifters. If I bought a Bleriot, it would be to use as my commuter bike, so I would have to buy some barcons rather than just swap over the DT shifters I've already got on my existing commuter.