JW,
more bling is by far better. Here is my 2 cents after having bought many lasers. At all costs, get a self leveling model, or suffer! The bubble mounts leave way too much on the table due to human error. They have cost my company a fortune in the past. Do not skimp on the tripods either!
Topcon and Eagl are both excellent lines, and get my nod. I have had several David Whites. I will take a pass on owning another. They eat batteries like no tomorrow, and they are not dependable in my book.
Guys using string levels... I wish you the best, but I am afraid that you are running down mediocre street. Upgrading will save you time, and increase your productivity quotients.
Better tools will usually render better results. Nay sayers may disagree, but anything can be made not to work given awkward, or extreme circumstances.
If you have a model T in the garage, and a brand new truck on the drive, which one do you think you should drive everyday. The same old way, gets you the same old profit margins. I opt to improve the bottom line even if I have to make a payment to do it.

Tim (I reread this and I think, "Did I get off on a rant?")