Travis Fireplace Xtrordinair 616 Insert - Thoughts?

Good morning, Everyone. We're in the midst of gathering quotes to replace our 20 year old oil furnace with either geothermal or a high efficiency NG unit. That may not happen for a year or two, however, so we're looking into replacing the current builder-grade NG logs with a insert. Our pellet stove shop also sells this insert which I'm leaning towards. They also suggested a Travis DVL which was a bit pricier. Basically, I'm looking to supplement the oil furnace (for now) with an NG insert, heating the main floor which is approximately 1,300 sqft. Ceiling fans in all the rooms to help with circulation. Double-pane windows all the way around but the insulation needs to be updated (house was built in 1957).

If anyone has any thoughts and/or input on this unit, I'd appreciate it.

Thanks, in advance!