Hughes & Kettner Tube Rotosphere

As a lucky owner of the original unit I could compare both and the plugin does a great job in capturing the vibe. However it misses one trick in my opinion - the speed switch! Ok, you could fiddle with the two speed knobs and automation but part of its charme and character is the ability to switch between two pre-set speeds. Maybe in a future update? However it's a great addition and makes working in the box a lot easier.

Guitars and Keys come alive with rich harmonics and exquisite swirliness! Great control over speeds of upper and lower frequency rotor speaker sims. Nice and gentle Breaker switch to ease your speed of swirl to a stop or back up to your speed settings. This has a character of its own beyond rotary speaker effects!
If I may add a suggestion for a future update (not crucial):
I'd like to see a overall mix knob on this. I managed to achieve this other ways a) using Blue Cat's Connector, b) as a plugin within Blue Cat's Patchwork. c) or simply set up an AUX track etc.
Another suggestion would be: to be able to switch via MIDI between the A and B setups. Like a Leslie going from a slower swirl to a faster swirl setup. I can achieve this also other ways anyway (2 instances of Rotosphere).
Try Rotosphere into Nembrini's "Jazz Chorus" amp with some mild chorus! You'll go to guitar modulation heaven!
Thank me later!!!

Very cool and great sounding release!

I both know a lot of Leslie simulation plugins but also have been using this unit in reality for a long time (unfortunately I sold it once and meanwhile it is discontinued) and for me it does exactly, what you expect from a very good Leslie simulation, without needing to use the too heavy and too big original chest, while getting comparable, if not even better adjustable sounds. 

Very warm, organically and vintage sounding, convincing and authentically sounding and behaving rotary tones, well and flexible adjustable (separate drum and horn speed adjustments plus drum and horn blending control). Also the guitar/keyboard inputs allow more flexibility, not to speak of the tube drive intensity control. If you use a Hammond organ plugin, you can easily adjust even typical Jon Lord sounds, but of course also very clean but still warm and organically sounding ones, but also sounds great with guitar in front of eg. a Tweed, Vox or Marshall amp, but also works well with more modern amps. 

The effect can be very subtle, but also very intense and everything in between, but it always sounds really good and vivid. 

I personally like this unit even more in combination with a (polyphonic) octaver plugin with -1 oct setting, almost gives you some sort of fake-synthesizer sounds from your guitar or bass, or use it with a Taurus, MiniMoog, OB-Xa or Prophet 5 and you also get awesome sounds and if you activate Break, you still have a wonderful warm and great sounding tube preamp active without this typical Leslie modulation. (So also well usable as a nicely vintage voiced tube (warming) pedal/preamp, but not only.)

For me one of the best and most authentically sounding effect (pedal) plugins, I ever have heard. 

Must have, if you look for good Leslie sounds!

What about a Zendrive 2, Tube Driver, Cream Machine, Tubeman or Kaluna II plugin? ;-)