[txgrassguy]

A couple of times. Spacing wasn't an issue once I knew what type of soil the drip was going to be installed and at what depth.
I used a pull behind irrigation trenching saw that was a rental unit - similar to what the invisible dog fence schleps use but with a slightly wider wheel.
Made sure the main line feeding the laterals had a sediment filter plus each lateral had a smaller one as well. Was on contract for quarterly maintenance until the dude had a terminal vapor lock.
Don't see an issue once you know the soil type and have some reasonable idea of capillary flow characteristics to space the lines properly.