I don't think I'll regret the IPV.
I've been trying to decide between it and the
sigelei 100w Plus and Sig150w, for months.
I just joined an "Owner's Group" on Facebook, and somebody posted a pic of the SX chip at 165watts, and ohm-display accuracy updates to hundreths/0.01 ohms!!
... He said this upgrade will be available to the IPV3 in early December!! The 0.01 ohm upgrade alone makes me extremely happy I grabbed 1, if this is true.

I'm just bummed I got the new version with charging disabled, and the screws will be a pain.
But I don't think I'll regret buying the IPV3 over the Sig's if that update is true. Got a great deal (cheapest I've heard of), can't wait til it's here!