I have an expensive Topcon rotary that I picked up at auction and fixed.
I also have a cheap Ikovwuk brand 3 plane green laser that I bought from Amazon a couple years ago. I haven't touched the Topcon since I bought it.
I use the three plane on top of an old camera tripod I had. I find the three plane to be so useful for so many jobs. I've used it to set up frame pulls in my shop. I've used it with a surveyors stick to check the level of the floor in a room we were going to put new flooring in. Also to check the level of a concrete slab that was sinking. I used it to set some beams parallel in my basement and to level the posts holding them up.
I would highly recommend one of them. .