One of the reasons for difficulty in knowing if a particular used piano is a good choice is because defects in pianos can be hidden or intermittent (it only occurs occasionally which is usually difficult to detect), or you just don't have enough personal experience to know what's good and what is bad. Both digital and acoustic pianos are very complex instruments and when you subject them to a hot, dry climate like we have here in Arizona, that can create even more problems as anyone here can tell you. Too much humidity in acoustic pianos over a period of time can also create bad, on-going issues.
So the bottom line is, BE CAREFUL! Extra dry weather, extra humid climates, unknown factory defects that are no longer covered because the used piano has no warranty are all reasons a used piano can come back to bite you in the end. That doesn't mean however there aren't good used pianos being sold, it just means "buyer beware." Also, just because a person buys a NEW piano doesn't mean there won't be problems with the new piano because some of them are just designed and built poorly in the first place. But if you are buying from a reputable piano dealer, a trusted private party, knowledgeable piano technician, or you just know what you're doing, then you should be able to find a good used piano for a reasonable price. However, before you buy any piano anywhere, contact me first and I can give you helpful free advice and also show you how you can save even more money on your purchase.
*No matter where you live in the US or if you happen to live here in Arizona in the "valley of the sun" including Phoenix, Scottsdale, Glendale, Cave Creek, Carefree, Anthem, Tempe, Chandler, Mesa, Gilbert, Queen Creek, Laveen, Goodyear, Ahwatukee, Avondale, Litchfield Park, Buckeye, Surprise, Sun City, Peoria, Wickenburg, and other valley locations...
please contact me for more info at email@example.com or if you are anywhere in the US then you can also call me at 602-571-1864 during my posted studio hours.