Agree on RB5009. But have a few RB1100AHx4 that we use to run Dude and hosting VPN tunnels to remotely managed devices.
But main advantage of RB1100AHx4 is that it has internal disks. Downside is there NO USB and it’s ARM32 (while RB5009 has both).
Also RB1100AHx4 does have the nifty “bypass” port, so if you have it sitting between routers, and RB1100 get powered off…ethernet will still flow between port 11 and 12. It also has a 3 switch chip design, which is a mixed bag since it’s tricky to keep hardware offload with VLANs (but I guess in some case three independent switch chips might be handy if topology needs that)
Now… some newer RB1100AHx**5**, with the RB5009 guts but just a few disk holders might be a nice offering between RDS (with too many disk and higher price) and RB5009 (only USB disks, but no expandability)…