Having had the ETI installed Jensen stereo in the 17 I knew we wouldn't be doing that on the 21. That is a car stereo and most know you can spend $$$ on car audio with amps/speakers, etc. The ETI version is good in the realm of good/better/best IMO.
I was thinking about one of the Bose units that friends have yet wasn't keen on spending the $$ for one. As it turned out we got very lucky and saw an Acoustic Wave at a thrift store and bough it for a song
Having had it now for five months it is pretty awesome and versatile. With our battery charger/tire pump we can take it out away from the trailer when we're sitting. With the AUX Out & (now on newer models) Bluetooth one can use it with TV, laptops, tablets, etc. The sound is really amazing; and in a boondock situation with no one around cranking it up outside is
. I would spend the $1100 for a new one now- but if this one dies(1999 model) then they'll sell me one for 1/2 price. That's their policy and you don't have to be an original owner
The first Bose product we bought was ten years ago we gave each other headphones as we were flying a bit. The thirty day satisfaction thing made us gamble we would think they were worth it for $300/ea. Still love them and don't leave for airports w/out them
So for those of you who are undecided on audio option you might take them up on the trial period and check one out.