Yes, true. Basic is the right word. Japanese brands take everything further.
Just ask me ^^ I tested like a few Onaholes.
To start with, I recently made a small guide of my top 5 Onaholes for interactive devices. I also talk about the FUNSR PRO there and if they fit for it.
Top 5 Onaholes for Interactive Devices - Review / Toy Review - EroScripts
And on my review blog, I have a comparison table, which gives you a quick overlook which Onaholes fit for the FUNSR PRO. Most of these which worked for the FUNSR1, also work with the FUNSR PRO. Full review of all Onaholes are also on my blog.
Comparison Tables | Slibowitz
If you have any questions about specific Onaholes, just let me know.