皮实 Sturdy. Said of objects that are solid and durable, and of people who are strong and robust.
经久耐用 Lasting long and standing up to use. Said of goods that hold up over time.
实惠 Real benefit. In the phrase 经济实惠, economical and of real benefit.
华而不实 Flowering without fruit. Showy outside and empty inside. The phrase goes back to the Zuo Zhuan.