Terry London loved the model 50s...and they have a 30 day return....
But...part of the consideration should be when the day comes that your are ready to try something else, how easy will they resell and what percentage of the price you paid will you get back.
Not a lot of resales with the NSMT so its hard to tell....
Lots of resales with the Zu...they are pretty easy to resell...and now that they no longer make the dirty weekend...the resale price is creeping up....but it still might be worth buying preowned.