I have used the regular Shrubbler for years to irrigate my roses and blueberries and they work fine. These newer pressure compensating shrubblers work better. With the older Shrubbler, when there are a large number if units on one line, the units on the end of the line sometimes emit much less than the ones at the beginning. They are adjustable, but this was not convenient and sometimes hard to deal with. These pressure compensating units all emit the same amount no matter where they are in the line. I have 30 of them on one line irrigating 15 blueberry plants and they work perfectly. The flow cannot be adjusted, but amount of water can easily be controlled with time. They are a little more money, but worth it. I use two for a large blueberry or hybrid tea rose.