To make matters a bit confusing, Roland produces a mainstream version of the RP400/500 called the RP501R. The RP501R ($1499 internet discount price incl bench) just replaced the previous RP401R and the differences between those 2 models are the same small differences as between the Costco versions RP500 and previous RP400 (Bluetooth & speakers). However the RP501R mainstream internet version has even more features on it as compared to the Costco RP500 version. Those differences are the built-in interactive rhythm accompaniments & music styles on the RP501 which the RP500 does not have. The interactive rhythm accompaniments and arrangements allow a person to play with any style of music background that they choose such as rock, country, Latin, Jazz, Blues, waltz, march, etc along with a one-man-band that can make you sound better than you really are:). This is a fun feature and one that can also help with rhythm and timing training. Some people may use this feature and others will not care about it based on how you want to play the piano. However on the RP500, Roland has an iPad app called Piano Partner 2 which allows connectivity between the RP500 and an iPad with the ability to produce a limited number of interactive styles as well as built-in digital sheet music accessed from the iPad app. But...you would need to have access to an iPad tablet to have these features available to use on the RP500.
The Bluetooth connectivity on the RP500 does not allow for or do audio streaming which is actually what most people want when it comes to Bluetooth connectivity, so you cannot run iTunes or or song libraries through the RP500 using Bluetooth. The Bluetooth functionality on the RP500 will connect to external device for selected "MIDI" apps and for specific sheet music apps that allow for instant Bluetooth "page-turning" so your foot can press a pedal and the page of a song will turn instantly on the iPad when you are ready to do that. For a detailed review on the RP500, please read my review of the prior RP401R at the following link: Roland RP401R Review. *Now remember, the only differences between the discontinued RP401R that you'll read about on my review and the new Costco Roland RP500 is that the RP500 has a couple of Bluetooth functions and the RP401 has the WiFi connectivity & built-in interactive rhythm accompaniment styles which the RP500 does not have. Otherwise, everything else is identical. There are a few downsides to the RP500 (same on RP401R) that you should pay attention to when you read my review.
If you want more info on new digital pianos and LOWER PRICES than internet discounts, please email me at email@example.com or call direct at 602-571-1864.