Is it worth it? Consider 4 factors.
1) Are you dating? At 5'9, you're average, but at 6', height will work to your advantage with women.
2) Do you have the money to spare? It's at least 70k USD all-in in a developed country, plus 6 months of reduced work capacity.
3) Are you athletic? Unless you play basketball/volleyball where height is advantageous, your athletic performance will decrease with LL.
4) How old are you? If you're 30+, you will need to lengthen less, and struggle more with physical recovery.
If you're young, dating, not sporty, and have money to spare, it is definitely worth it. If not, then you have to weigh the factors yourself.