Retail price for RC-20 is approximately $99 USD. It goes on sale frequently (Black Friday, Summer Sales) for around $60-$70. For the quality of sound and the sheer amount of time it saves (you would need five different plug-ins to replicate what RC-20 does), it is an absolute bargain.
Even with a stable update, users might encounter hiccups. XLN Audio RC-20 Retro Color v1.3.5 -WiN-MAC-