Turning to the DCR-150: no magic magnifying side but nevertheless a more obvious ease of use as the 250 (except when used with a foot). The quality is there ... We still finding a small vignette in "normal" use; mean by this that the windscreen does you use has a "macro" and / or close to the subject you want to shoot.
A strange thing: why put 2 caps / plugs in the front and rear as complicated to remove and replace ?? It makes you wonder if the Raynox's staff tested their product on this one ...
Anyway, the windshield does the job and certainly, the price is higher than a "telephoto" found on a well known ad site, but yes, we really see the difference in rendering and dive.