I'll give you my personal example: Many years ago, I added a second bass drum to my kit. At the time I was unable to shell out the money for the exact model as my first bass drum, opting instead to downgrade to a more entry level kit for my second bass drum. Although the drums have similar woods, they are not identical, and it has always been a struggle to create a balanced sound between the two. I was always resistant to triggers, but have recently purchased bass drum triggers out of desperation. Although the sound of my drums in now wonderfully uniform, instilling my playing with greater power and confidence, there are problems. The triggers are contantly not triggering at all or too much, or causing like hassles, regardless of how much I tweak them. A solution they are, but no piece of cake.