Pros
Huawei is a highly successful company that has come to dominate the telecoms infrastructure industry in a few short years. It offers high quality, innovative products and invests heavily in R&D. Huwei has simply out competed Ericsson and Nokia by first undercutting them and then out engineering them. The company invests hugely in engineering, but is no particularly creative or innovative.
Cons
Huawei is not a good work environment for the Western workforce. It is a Chinese company with some international presence. Westerners are tolerated at best. No Westerner can have any real authority or influence. Westerners aren't really trusted and the cultural expectations of a Western workforce are barely acknowledged by Chinese Management. The organization is hugely hierarchical and fast-track managers are often catapulted into roles that they have no understanding of and no real ability in. Decision making is highly centralised, as are budgets. Forward planning and reasonable treatment of employees is rare. The companies Personal Business Objectives drive a lack of cooperation and "big picture" thinking. People focus purely on their personal business objectives and the financial rewards they bring (and the rewards can be huge) without any real analysis of whether they are the "right" things to do. This all contributes to a highly unpleasant atmosphere. Knee-jerk reactions, last-minute decision making, lack of consultation and micro-management. Huawei pays well, but you sell your soul, and no (Western) employees really enjoy the company.