Zabardast!
Wonderful and Great to know about your experience. Definitely, nothing beats a Window AC, but since they are hardly available in markets I think, so we have to settle with Split type ACs.
Regarding cooling, well, I have no issues with the refrigerant / cooling gas, however, as per my personal experience, Non-DCs abruptly start cooling and then compressor fully trips when it attains it's temperature, and cooling is abrupt (observed this in many models, Haier, Samsung, Dawlence). However, in case of DCs, I have observed that cooling phenomenon is not abrupt, rather continuous and slow, and when compressor attains it's temperature, it doesn't fully trip, rather goes to min. Rpm.
I am not satisfied with the cooling of DCs inverters. To me, Non-DCs are better when it comes to abrupt cooling, provided temperature and brand are same (i.e. Haier and @ 23-26°C. I have hardly tried 21 in my Haier DC Inverter. 23 is the min. In case of extreme weather, otherwise, and in normal conditions, 25-27). This is my observation; Others can disagree.