Like you I have played things with strings for decades, even played around a few wind instuments.
Also, like you I bought an Chinese model (Arretta) because it was cheap. At $180.00 I could give it away if I did not like it. Thanks to Mr. Powell and his videos I can croak out a few tune and have had an great time learning.
On the down side, you do get what you pay for. I have had to replace some of the button springs and as your ear for sound developed you soon notice the richness of the more expensive instuments.
As with any instrument when your skill level develops you will know when it is time to move on.
Unfortunately, unilke guitars and fiddles, you do not find quality sqeezeboxes in the pawnshops.