We have put about 7500 miles on our 2015 Solera which we have had for about a year. The Mercedes has given us no problems. By the way they increased the oil changes to 15,000 miles. We have had a couple problems with the coach which the dealer has taken care of at no cost except time. We love going places in the Solera, it turns much sharper than the Fords, does not get thrown around by winds as bad as the Fords, pulls a load without sounding liking a jet taking off like the Fords. It is very easy to drive even in towns. It can be parallel parked! It gets 13-16 mpg.
Negatives are that the black and gray tanks and waste lines are just hanging out in the weather to freeze(We live in the Montana Mountains)(I built a box around mine and installed tank heaters). Number 2 is sway which really doesn't bother me while driving down roads of any description but is bad when turning on uneven ground at slow speeds. There are many threads on this topic if it bothers you enough to do anything about it. So far we really love the Solera, it makes going places and stopping wherever you want a joy.