I don't owned Verza but customized Go-Dap X that should be very similar to Verza in term of performance. The main difference between Verza and my X is OpAmp. Vmoda choose OPA1612 for Verza but mine is LME49860, same as in Sony PHA-1. Verza or X should fall a little bit behind HP-P1 but consider its price and form factor, that's a bang for a buck.
Verza should work fine with lightning connector. There are other iDevice DAC/Amp that will work with lightning connector such as, VentureCraft Go-Dap X, ADL X1, Centrance HiFi-M8, Sony PHA-1.
For CLAS, both Verza and X will be further behind. If you need iDevice DAC other than CLAS, I recommend VentureCraft Go-Dap DD Socket 1 LE. Single end mode is as goog as CLAS but still can't compare to the CLAS when it's running in balanced mode.
Lightning connector is digital only but there is a way to convert those digital signal to analog. Apple lightning adaptor is equipped with Wolfson DAC, so it will be able to convert digital signal to any amp you choose.
For further impression on Verza, please go to Verza thread.