That's reassuring, good to know, specially the make (I assume you're near the ocean). The guy who came to see me was a reputable Brit and he only dealt with TGM types... (27k pesos all in installed for a non-inverter 12000BTU, last year price, I think he said that is for a new model with copper tubing etc.)
But I never installed any A/C split so far, so no experience - still using the tiny 5000 BTU on the window edge occasionally....
The key is the much higher SEER rating of the newer inverter model split AC units. The higher the SEER rating, the more efficient the unit. The split units have more features other than just setting a temperature, which most people never use.