Good, well-t CHARACTERISTICS have Describes by Funkypopol.
The effect is ditable, but not as mmorisable dvelopps certain effects in this format by Boss Twin Pedal. Too bad.
The connection is complte, there's even a jack for an expression pedals. The format is a little large at first for a pedalboard, I prfr a simple but pedals use, we gain in comfort. -1 Point to go the lack of memory.

UTILIZATION

So I put a few dozen minutes to get a really nice sound. I thought it would be simpler, but there really is a lot of paramtres grate, including paramtres which dixit the manual, do not appear on a real Leslie 122. So, you can really fine tune the sound more prs.
The manual is succinct but sufficient, even for me

SOUND QUALITY

I never had the hands of Leslie, so I do not really have a point of comparison. The only comparison I could make is with the pedals of rotary dveloppe Line 6. J'tais actually went to buy the Line 6, but APRS test, I found the sound trsdcevant, trs muddy.
So, I eyeing towards Univibe (Dunlop, Voodoo Lab), but the lack of paramtres me a little scrap. So, I bought the RT-20 without even having tried. But hey, 159 in France, the risk limit even when silent. J'tais rticent just take my RT-20 because I had a Boss VF-hands, and simulations of COSM Rotary Embedded in this multi-effects I had not at all convinced.

It seems to me that the simulations are ralistes, I get much closer to me sounds of musicians known to use rotating speakers. My preferences in terms of simulation goes to THE FIRST (mode I) which reproduces the sound of the Leslie 122. APRS, the other options / modes are just variations of this simulation. The 4th mode is a simulation of Univibe, I do not like the masses (I wonder if I'm actually a fan of Univibe ).
A priori, the sounds of HP seemed to better simulate rapid turnover than those with slow rotation, although I managed to have a good rsultat also in this area.
The thing that makes me really tripper is that pressing on the two pedals simultanment, it activates a "breaker", a brake that stops gradually (this speed knob dpend the "rise time") rotating speakers. and you end up with a sound enough crmeux, warm, with nice bass, jazz in all. All I was looking for
A small point less for the expression pedals that can rgler the speed of the speaker. I AIM we can activate the overdrive, could be a nice. The quality of the overdrive is not stunning, but hey, it's not so horriiiiiiiiiiiiiiible what some seem to say on sites like Harmony Central ... Srement of true aficionados of vintage vacuum that particular portfolio. Personally, I use it all fawn not, the fact that speakers switch rapidly rotating dj brings a semblance of overdrive mmmmmmhhh yum yum.
Another nice thing is that you can make a balance between the two speakers as they sound sweet prfre more aggressive. And then you can grate the amount of signal untreated and treated as we want to keep some of the timbre of his instrument.
In short, we plthore of rglages, I did not ask for much!

OVERALL OPINION

So I use it for only a few days, I will update as and a measure of my tests. I play a Chapman Stick on a keyboard amp, but I'm ending for use on sound, we'll see what a deal.
Report quality unbeatable price for me. As I said, before buying, j'tais priori rticent take me quite a Boss, because until then, I was operating with VF1 which did not satisfy me at the Rotary simus . It is with great mfiance that I finally convinced by RT-20 and honntement, I do not regret my choice.
Just something to finish: the screen to visualize the rotation of speakers, I'll be fine. It is not absolutely nothing, and was spending all pedalboard for a tree Nel. Frankly, it's corny supra (go hop least one point - well, with all these 9 / 10, did what average gnrale ...??? Ben 9 / 10; -)