Pros of the Changhong Ruba 1.5 Ton Heat and Cool Series Inverter AC (CSDH18MAW):

Saves up to 68% energy and brings down electricity costs greatly.
Can be run as an air conditioner during the summers and as a heater during winters. This is possible via the click of a button.
Turbo heating and the cooling feature ensures you get the best out of your appliance.
Gold Fins evaporator and condenser have been specially designed to make the appliance eco-friendly and energy-efficient.
Double layer condenser and 100% copper connecting pipe ensure that all energy input into the appliance is used completely and properly reducing waste. Hence, the air conditioner does not add up as a load on your electricity bills.
Low voltage start allows you to run the AC even if you are not receiving full voltages from your substation.
Auto-restart and hidden LED design are added features.
Comes with a 1-year appliance warranty and a 3-year warranty on parts.

Cons of the Changhong Ruba 1.5 Ton Heat and Cool Series Inverter AC (CSDH18MAW):

Average cooling.
Only available in a single color.

Should I invest in a Changhong Ruba DC inverter AC or look for inverters offered by other brands?

It really is up to you. If you are looking for an appliance which will keep the heat at bay, will not cost a lot to run and is fairly priced, then go for Changhong Ruba inverters. Else, go for other brands if you really want to chill down your room or space. Moreover, if you are looking for other added features or a specific color, then Changhong Ruba ACs may not be your best bet.

It is also important that you understand that although Changhong Ruba ACs do not cost a lot and are energy efficient, they do not provide extreme cooling. So, if you choose to run them longer, sooner or later it is going to start costing you as much as any other inverter AC. Also, some other brands offer better cooling and are almost as energy efficient. They are only slightly costlier. It all depends on how much you are willing to invest.