Here are some words and expressions you can use to talk about advantages and disadvantages:
• It’s cheap and, what’s more (in addition) , it’s reliable.
• Not only is it cheap, it’s also reliable.
• It’s cheap, but, on the other hand, it’s unreliable.
• Whereas X is cheap, Y is more expensive.
• Although (even though) it’s expensive, it’s not very reliable.
• Despite (In spite of) the price, it’s not very reliable.
• Is it cheap? No, on the contrary, it’s expensive.
• X, unlike Y, is very good value.
• It’s not reliable and in any case, (besides) it’s too expensive.
• It’s too expensive. However, we have a cheaper model.
• It’s very expensive. Nevertheless, I’ll consider it.
• I want a guarantee. Otherwise, I won’t buy it.
• Whatever you say, I won’t buy it.