Welcome debdog,
The Alpine line was newly released in 2010, so odds are there may not be many *used ones* available.
Regardless of which brand of RV (car, truck, refrigerator, or computer) you buy, there will always be 'someone out there' who had a bad experience with that brand & has negative comments -- it's just the way things are with humans!
Yes,
there are Keystone 'lemons' that surface on occasion... but it happens with 'every' brand of RV, regardless of price paid. None of the members here are 'brand' cheerleaders, but the greater majority are happy with their purchase.
http://keystonerv.org/forums/showthread.php?t=3015
And, simply for the sake of clarity... Keystone is also owned by Thor Industries (parent company)... as is Airstream, Crossroads, Dutchmen, and Heartland in addition to Redwood.
http://www.thorindustries.com/home
There are some Alpine 3450rl owners here, hopefully some will chime-in soon & answer your questions.
Good luck with your decision & happy camping.
Terri, the Chevy co-pilot & DH Kevin