I own both,Ikawa V2 and Roest. Without any doubt, the Roest is superior,larger batchsize up to 120g,roasting and cooling at the same time,even with lightroasts around Agtron Gourmet 95( Lighttells Cm100 measured) absolute uniform roasted beans, great support from the Roest team. The only advantage of Ikawa is the size, great for travelling. Translating sample profiles to a bigger production roaster is a lot more easier with the Roest, creating own profiles depending on ET,BT or heating power super easy,complete manual roasting a dream. The machine is very powerful,probes are super sensitive,the whole system is very easy to understand.