Are there any other problems with laser except metamerism?
Longevity: This is anecdotal just based on my own experience, but a number of the benefits that have been promoted are not panning out so far. One of the big ones besides peak light output (which is the #1 benefit of laser) is longevity. There is a thought that laser projection will lower costs as laser packs last 6-7 or more years and will offset the cost of xenon bulbs ($1000+ cost every 900-1500 Hours). This isn't completely playing out though, as in some cases laser packs are needing to be replaced in 2-3 years. If you are in warranty then replacement might be covered, but if you are not the costs can be very high. The bottom line as a business owner is that you need to have a plan if the laser packs don't last as long as expected and you are out of warranty.
Speckling: In 2018-2019 was a large problem, but like Rune says, it has been fixed in some projectors by vibrating the DMD in the light engine. This is the way the Eclipse handled it and why it never required a vibrating screen. You'll need to check on a model by model basis to make sure whatever you buy addresses this as well.
Power/AC: Other issues to watch out for are power and cooling requirements. Some laser projectors are attempting to be drop-in replacements for xenon, but others, especially ones that promote higher light output will need additional power and AC capacity to reach those light levels.
Black Levels: Finally, and this is a big one, while laser is brighter, it doesn't inherently have better black-level performance. Low min black levels are achieved in the light engine. The Eclipse creates low black levels by using an initial white-only DMD that controls luminance with a second RGB DMD that controls color. It's a very similar concept to how DMCL panels work, extended to projection. The thing that makes a really good display stand out isn't it's light output, its the black level performance. So, if you are able to do a xenon/ laser comparison make sure that you note the black levels as in a lot of cases it will be exactly the same as a xenon. A lot people assume that this issue goes away simply by moving to laser (like say, buying an OLED), but it doesn't and it's a very complex problem to solve.
[Edit: one more addition...]
Safety: It's pretty common in a lot of situations to walk through the beam of a projector, either getting to your seat or when walking up to the screen to examine things like sharpness, convergence, uniformity, etc. You need to be careful when doing this and avoid accidentally turning around and looking into the beam of a laser projector. If the right content is up and you get hit directly in your retina it can cause temporary spots in your vision, or even something more permanent. You'll probably need to hang warning stickers on your theater doors and make sure to remind anyone that comes in to be careful.
