I second the uniform high quality of all the WEM "little bits" I have bought to date, primarily to dress up my 1/700 ships. Doing a side-by-side comparison of their 1/700 CIWS with the plastic ones that came with the kit, for example, well ... there is no comparison! Some of these ship fittings are almost little models in and of themselves, and their 1/700 airplanes are also uniformly exquisite.
My only concern is that there isn't enough of a demand for some of the smaller items, especially airplanes, and they are discontinuing some product lines. I'd advise you to take a look at their website or, if concerned about a specific item, ask if they intend to keep it in stock - I know we ALL are excellent at planning ahead and anticipating every possible need we will have for pending builds.