its common but kind of drawish or messy if you dont know how to use it
Opinions on London system
It is OK at any level. Carlsen and Kramnik have played it. Bf4 is a developing move, so it cannot be wrong. Bf4 violates the principle to develop the knights before the bishops, so black can try to punish it with ...c5 and ...Qb6 striking at pawn b2, but a premature queen sortie violates principles too.

It is OK at any level. Carlsen and Kramnik have played it. Bf4 is a developing move, so it cannot be wrong. Bf4 violates the principle to develop the knights before the bishops, so black can try to punish it with ...c5 and ...Qb6 striking at pawn b2, but a premature queen sortie violates principles too.

It's ok. The better version of it called the Jobava London, where u put ur knight on c3.
It's more aggressive than the london, and more likely to catch an opponent off-guard.

It is somewhat common, I have played only 1 game of it against a 1500+ opponent but I have played a 1300-1400 opponent who played it as well. I guess the reason why it isn't too common is because it seems people are much prefer playing e4 rather than d4 at my level

Too many people get sucked into just getting their “London” position every opening but in reality it’s a setup based system to create an advantage from what black plays.
So depending on what black plays you can create a very strong attack early. Or you may end up building up an attack on the queenside.
Regardless, it’s a great opening which GM’s use. But any opening is as good as how much you truly study it at the end of the day.

Too many people get sucked into just getting their “London” position every opening but in reality it’s a setup based system to create an advantage from what black plays.
So depending on what black plays you can create a very strong attack early. Or you may end up building up an attack on the queenside.
Regardless, it’s a great opening which GM’s use. But any opening is as good as how much you truly study it at the end of the day.
Rightly said!

It's not a bad opening, but it pratically skips the opening step to go right to the middlegame and that's why is not considered particularly instructive for beginners/intermediate players. GMs who play the London have played almost everything in their life.

𝐻𝑒𝑙𝑙𝑜,.. 𝑇𝑟𝑦 𝑡𝑜 𝑝𝑙𝑎𝑦 𝑜𝑛 𝑜𝑡ℎ𝑒𝑟 𝑝𝑙𝑎𝑡𝑓𝑜𝑟𝑚𝑠, 𝑙𝑖𝑐ℎ𝑒𝑠𝑠 ℎ𝑒𝑙𝑑𝑠 𝑎𝑛 𝑒𝑣𝑒𝑛𝑡, 𝑡ℎ𝑒𝑚𝑎𝑡𝑖𝑐. 𝑌𝑜𝑢 𝑚𝑎𝑦 𝑠𝑢𝑔𝑔𝑒𝑠𝑡𝑠 𝑎 𝑙𝑜𝑛𝑑𝑜𝑛 𝑠𝑦𝑠𝑡𝑒𝑚 𝑎𝑛𝑑 𝑖 𝑤𝑖𝑙𝑙 𝑠ℎ𝑜𝑤 𝑦𝑜𝑢 ℎ𝑜𝑤 𝑖𝑡𝑠 𝑑𝑜𝑛𝑒.
𝐿𝑒𝑡𝑠 𝑝𝑙𝑎𝑦 𝑡ℎ𝑒 𝑟𝑜𝑙𝑒 𝑜𝑓 𝐴𝑑𝑜𝑙𝑓 𝐻𝑖𝑡𝑙𝑒𝑟, 𝑀𝑒𝑖𝑛 𝑘𝑎𝑚𝑝𝑓 𝑠𝑦𝑠. 𝐴𝑔𝑎𝑖𝑛𝑠𝑡 𝑇ℎ𝑒 𝐿𝑜𝑛𝑑𝑜𝑛 𝑆𝑦𝑠𝑡𝑒𝑚 𝑣𝑎𝑟𝑖𝑎𝑛𝑡!
--- 𝐶𝑙𝑎𝑟𝑘 𝑅𝑖𝑐ℎ𝑎𝑟𝑑 𝐵𝑢𝑒𝑛𝑜 𝓓𝓮𝓮𝓹𝓑𝓵𝓾𝓮 𝓵𝓮𝓰𝓮𝓷𝓭

𝑠𝑒𝑒 𝑚𝑦 𝑃𝑜𝑠𝑡𝑒𝑑 𝑔𝑎𝑚𝑒𝑠. 𝑒𝑣𝑒𝑟𝑦 𝑚𝑜𝑣𝑒 ,𝑎𝑟𝑒 𝑝𝑟𝑒ℎ𝑖𝑠𝑡𝑜𝑟𝑖𝑐, 𝑡ℎ𝑒𝑦 𝑐𝑎𝑚𝑒 𝑓𝑟𝑜𝑚 𝑡ℎ𝑒 𝑎𝑛𝑐𝑖𝑒𝑛𝑡 𝑡𝑖𝑚𝑒𝑠.. 𝑇𝐻𝐸 𝐵𝐸𝐴𝑆𝑇𝑆 𝑇𝐻𝐴𝑇 𝑊𝐴𝐿𝐾𝐸𝑇𝐻 𝑇𝐻𝐸 𝐸𝑎𝑟𝑡ℎ.. 𝐴𝑛𝑎𝑙𝑦𝑠𝑒 𝑡ℎ𝑒 𝑖𝑚𝑎𝑔𝑒 . , 𝑦𝑜𝑢 𝑤𝑖𝑙𝑙 𝑠𝑒𝑒 𝑎 𝑑𝑖𝑛𝑜𝑠𝑎𝑢𝑟 (𝑠𝑎𝑢𝑟𝑜𝑝𝑜𝑑, 𝑇𝑟𝑖𝑐𝑒𝑟𝑎𝑡𝑜𝑜𝑠, 𝐷𝑒𝑖𝑛𝑜𝑠𝑢𝑐ℎ𝑢𝑠.. watch the GIFS..
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To the players rated 1500 and above, what are your opinions on London system? Is it common at your level?