Ali (also known as Shiquanhe and Senge Khabab) does not have much of interest for travelers to Tibet, other than access to warm showers, good Chinese food and department stores to stock up on supplies or gear. It's a popular stop-over city en route to nearby attractions, more often than not, Mount Kailash.
Over the past 50 years AIi has become more of a Chinese city than a Tibetan village. An increase in tourism and the resulting influx of tourist dollars has attracted the attention of a significant number of Chinese entrepreneurs. This has resulted in a further increase in Chinese military and decrease in native Tibetan population.