You can ask those who have been using gunbot and i guess you will get the best answer. So many people are using gunbot too and that means if it's legit but that depends on yourself too whether you can put the right configuration for your bot or not. The bots are still having disadvantages too.
What are your thoughts about Uniswap trade bots. A good example is UNISNIPER BUYING BOT! It auto executes quick buy orders on Uniswap under 8.13 seconds
What about the configuration for the fees? We know that the ethereum is always getting clogged when there are so many people using it at the same time. That sounds impossible to happen but it can be a true story too.