We have an LX850 at our shop (probably not exactly the latex you were looking for, heh) and so far the main issues we've had with it are:
1. Printing on very open mesh materials fails -- if the mesh is too open, the temperature sensors don't function correctly; however, I don't think the L25500 or L26500 have mesh kits anyway.
2. Ink stretchability on fabric fails miserably. Bright colored prints look great on many fabrics, but if you try to get heavy, dark colors (e.g. for backlit fabrics) the ink simply cannot take the abuse necessary just to handle and sew the fabric.
However, most solvent printers (like the 9000S) can't run open mesh or normal fabrics anyway, so these issues are really irrelevant for most latex customers. It's a workhorse for normal banner and adhesive decal materials, and works well with a lot of specialty materials like Rexam paper, wallpaper, and other materials that wouldn't work well with solvent inks.