Yes huge problem with them. They will make you lazy. I'm the worlds laziest gardener bcuz of these blu mats. (Being sarcastic, kinda)
My only advice is for larger areas, use water pressure as oppose to gravity.
You can get by using the small ones. However the smaller, the less depth it will be able to censor, you can combat this by increasing pressure, or just use them as top water feeders to keep top soil moist, you just have to water by hand once a week.
Dont use chemicals or anything that can crust up the inside of these little hoses. Blumats are really water only.
Also upgrade with the drip extension for larger diameter coverage.