I understand this is a bit of an outlier.  But I like to play classic music, and sometimes a Leslie speaker is called for with a guitar.
 
If you want to add some Leslie to a guitar part, what do you use?

https://www.meldaproduction.com/MRotary

PSP B-scanner or L'otory.  PSP is HQ
 
 
http://www.pspaudioware.c...effects/psp_b-scanner/
 
or
 
http://www.pspaudioware.c...de_effects/psp_lotary/

Or LX122 from XILS
https://www.xils-lab.com/products/LX122.html

This one is very good for clean tones.

LX122 from XILS is the one I use
 

I'm with scook: melda productions.

a little off topic,
but i use a pedal,
it's the Fulltone Mini Deja Vibe,
it's great for that univibe effect, psuedo leslie, and also has a killer vibrato on it.

scook
https://www.meldaproduction.com/MRotary

That one does the Leslie but also goes beyond for more "unusual" modulation fx.
 
But if you're just trying to emulate a Leslie, the MVintageRotary is probably more suitable (and half the price of the MRotary):
 
https://www.meldaproduction.com/MVintageRotary?kw=mod
 

I have the Melda and the PSP plug-ins, and an H&K Rotosphere and Pigtronix Rototron, and I like them all, but for guitar I still use an old Vibratone, I just haven't found a plug-in or pedal that sounds quite as good.
 
For keys I really like the PSP plug-ins, for insane effects the Melda plug-in can do wonders.
 
But I have yet to find a reason to put my Vibratone up on eBay

Bill I would not sell that in a million years.  I have got something similar.  I pulled a rotating speaker out of a Hammond (home) organ that is constructed in a similar way.  It features a powerful 10" speaker and a rotating baffle in front of it and it stands vertically as well sending the sound out to the sides.  It needs a power amp to drive the speaker but the effect is very strong.  Great for synth pads and the like too.  I have modified mine to turn a little slower in the chorale mode too.