What another user wrote about the durability of the darts is true. Even the extra darts I bought did not withstand a hit on a hard target at close range. I believe it should not be used indoors like we do with the other nerf products. The Ultra darts have received negative reviews due to the marketing tactics used, but I wanted to see for myself if the negative things I read were true. I like the blaster, but the darts are not durable, they are expensive, they don't reach the advertised distance, and they are not accurate. I don't know if it's also the blaster's fault, as it seems to have misaligned flywheels.
Update: I opened it up and realigned the flywheels. I also removed the safety feature that prevents it from shooting different darts. However, the problem with the dart heads remains, and the glue I use to fix regular darts does not hold on the Ultra darts.
New update: The only way I found to prevent the Ultra darts from coming off is by using insulation tape around the connection of the dart head with the body.