how was the latter mentioned model received?
It received mixed reviews which praised its portability, but criticized the compromises made in terms of features.
MacBook Air
On its introduction, the MacBook Air received mixed reviews which praised its portability, but criticized the compromises made in terms of features. 
when did the macbook pro 13 come out 2006 what is this pro? It is the higher-end model of the MacBook family, sitting above the consumer-focused MacBook Air. how reliable is its keyboard? A report by AppleInsider has claimed that the updated butterfly keyboard fails twice as often as previous models, often due to particles stuck beneath the keys.
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MacBook Air [SEP] Reception
On its introduction, the MacBook Air received mixed reviews which praised its portability, but criticized the compromises made in terms of features. The full-sized keyboard, lightness, thinness, and Multi-Touch trackpad were appreciated in reviews, while the limited configuration options and ports, slow speed (in non-SSD models), non-user-replaceable battery, small hard drive, and price were criticized. The flip-down hatch on the side of the original MacBook Air was a tight fit for some headphone plugs and USB devices, requiring users to purchase an extension cable. Apple removed the flip-down hatch on the late 2010 model in favor of open ports like those of most other laptops.