"Fredrik" was shooting of a bench, I am interested in how it shoots off hand in the field.
As for Righty's liking a left hand lever, from videos I have seen, the impact is a gun that can be cocked without removing the trigger hand completely from the grip.
Taking into account that everyone is different, and has different preferences for optics, eye relief, and head placement for cheek weld, I have no problem shooting my Impact left handed in any position.
I am one of those who "climbs up on" or "scrunches into" the rifle VS shooting with a more upright head position and my face, chin, cheeks etc. clear the standard mag nicely. I have not had an issue with the stock cheek piece from the start, but I do not spend an extended period with the rifle mounted while shooting from the bench, or off hand.
I have an Aztec 5.5X25 FFP mounted in NCStar adjustable rings.
Now, on the issue of "compromise". That is a valid point, and perhaps I either do not notice, have gotten used to, or just do not care about the details like the cheek piece.
The platform works for me, and will work just fine for others who shoot lefty assuming that your expectations are not that it will fit you like a tailor made dinner jacket. It is more of a one size fits all situation. Judge for yourself, and if at all possible, shoulder one before dropping the coin.