Joe Blow Sport here. We're had it over a year and no problems.

Speaking generally, I haven't had good experiences with any of the "smart head" pumps that adapt to Presta or Schrader valves without changing the insides around. IME, the guts wear out, and the head no longer seals properly on a Presta valve. From now on, it's changeable guts or dual-head pumps for me!