I've had my new Lennox SLP98 now for a month, haven't seen any utility bills yet so can't comment on any savings but this house has never been more comfortable.
Being curious and an HVAC geek, of course I've kept track of firing rates, blower rates etc.
99% of the time, the furnace sits running at 35% and the blower running anywhere from 300 to 370 cfm, the blower rate determined by the discharge air sensor.
Right now it's one of the coldest days we've had and is +6 def F out. This is 11 degrees above design temp. The furnace is firing at 42% and 426 cfm.
After doing a test with digital thermometers that are all calibrated to 1/2 degree or so of each other, all the rooms in the house are within a degree of each other. Temperature swings are 1/2 degree at most. This is a marked improvement from the 5 degree difference there used to be from the end of the house above the furnace and the farthest end away from it.
My old Rheem used to run for 9 minutes and shut off for 22, temps would swing 3 or 4 degrees depending on where in the house you measured.
The Pure Air Media Filter and constant low blower at 300 cmf has dramatically reduced the dust in the house.
Unless the system is recovering from a setback and running above 50% or so it is absolutely silent.
Best feature though, was I received my rebate check from Lennox in the mail yesterday.
Only misgivings are the limited capability of the iComfort Touch thermostat in regards to Dual Fuel and no provision to schedule HP operation to coincide with on-peak/off-peak electric rates.
The outdoor temperature display is extremely inaccurate.
There is nothing that displays whether the furnace or HP is running, or what stage heating/cooling is operating.
The diagnostics display shows several operating conditions, none of which is static pressure.
Other than those limitations the system is awesome and I give it my recommendation!