This is my second cross line laser, the first being an earlier generation of an obscure brand that is no longer sold but served me very well for a number of years. I opted to get a new unit primarily for the convenience features that my other unit doesn't have: most significantly, the DeWalt is much smaller and lighter, and I really like the mounting options; specifically, 1) the tripod mount on the bottom that fits my very stable camera tripod, and 2) the magnets in the mount allow easy attachment to anything metal including a small metal Simpson tie plate that I can attach to studs with a screw in about 3 seconds so I can hang this things wherever I want.
I also like the fact that it flashes at you when you don't have it sufficiently plumb of level to be within the swing capability of the pendulum. That makes it easy to glance down at it and realize you need to tweak the housing a bit to get within those limits.
There are a couple of things that I don't like:
1) There is no lock on the pendulum for use during transport. This is probably less of a big deal than I originally thought, however, because it came to me via UPS with that pendulum clunking around inside, and after checking calibration when I first got it, the thing was right on the money. So, it can obviously handle some clunking around, and I'll certainly subject it to less of that than what it saw on its way to me.
2) It sure would be nice if it was brighter. I had hoped it would be an improvement over my earlier generation laser in this respect, but it's not. As I think about it, projecting a line beam over a wide degree range certainly requires more energy than projecting an equally bright dot, but it has made using it outside during the day a bit of a challenge. There is a $100 laser detector that you can buy for this thing that will allow using it over a much greater distance in daylight (the advantage of the DW88 vs DW87), and I'm waiting for one of the vendors I found who sells this detector to get one back in stock.
Meanwhile, let me offer some observations on its usability without a detector. At night, it's great. I've got up early a couple of times to shoot outdoor stuff at 4AM because it projects such a nice line over a long distance -- setting footing and pier elevations, lining up ground markers up the side of the house, etc. Indoors during the day, you can pretty much see the beam over any typically useful distance: within a room or across two or three rooms. Outdoors during the day, however, is where it gets challenging. With overcast skies you can get maybe 15 feet or so, sometimes a little better if you can cast a good shadow over the target area. This, by the way, is wearing DeWalt's over-priced, red plastic glasses to enhance the beam, which also make red print on a tape measure disappear so you have to move them away from your eye and back a time or two to get a measurement if you insist on using a tape with any red numbering like me. It also helps to have something bigger for the beam to hit that you can hold alongside of a tape if you're trying to get a measurement... I used a green kneeling pad angled up toward my eye to find the beam, and then did my best to align my tape with the edge of the pad since I couldn't see the beam on the tape. You could also set up a stationary target that you could mark and then measure. That said, my favorite time to use this laser outside is early morning or dusk unless I need 50+ feet... then it's pre-dawn or well after sunset.
Regarding accuracy, I have been really impressed. As one example, I shot 50' across the back of a house for a deck ledger location, and used that same projection to measure that height above twelve concrete piers for steel column heights, and the measurements came out as perfect as I could imagine (e.g., within 1/16" and/or my ability to tell). Using a tripod, I picked two locations about 50' apart, and swiveled the laser back and forth to the edges of its projected beam, and the beam projections lined up perfectly. I used this same technique to project elevations around the five sides of a large bay on the back of a house, and everything matched up well.
Bottom line for me: I like the unit, I'd buy it again, it's extremely handy to use and has worked well for me. I just wish it projected a brighter beam, maybe as an on-demand feature where you can get more light when you want it if you're willing to sacrifice battery life. Just an idea.