Factory-installed GoPower products work just fine as designed. As long as you have quality batteries (preferably AGM or Lithium) to store the energy, and your needs include charging laptops and cell phones, and occasional use of your microwave or low-wattage coffee pot you'll be good to go.
What you may find, however, is that the performance is marginal for many applications. For example, the GoPower inverter has a continuous output of 1500 watts with a 3-second surge to 1800 watts. All that means is that the inverter will operate at maximum capacity with some appliances, or not at all. There's no capacity for high-wattage appliances.
Likewise, the PWM solar controller works as designed, but is typically less efficient than an MPPT solar controller and with fewer features than the more expensive Victron solar controller used by many LOA members. All said, there's nothing wrong with the base-level GoPower solutions provided by Lance. Just be aware of the limitations. Regarding GoPower solar panels, I would say they are comparable to other aftermarket panels. I personally have used them with excellent performance.
In summary, if you're looking for a basic solar/inverter system for a new Lance, the GoPower solution will meet your needs. If however, you want a performance-based system with plenty of capacity, expandable and comprehensive monitoring, then skip the Lance factory solution and opt for a custom aftermarket solution. See the possibilities at Where the sun does shine. | Lance Owners of America
Mike