I picked up the Complete Series blu-Ray release of THE X-FILES, and was very impressed with the upgrade in quality. Definitely makes the show look more modern! However, while the series’ early seasons were shot on film, the VFX were edited on video. Thus, when they struck the new transfers for HD, they easily transferred the 35mm filmed portions to new 1080p resolution transfers, however they couldn’t redo the original video VFX on film in 1080p due to the exorbitant cost of recreating them on film in 1080p, so instead they simply upscaled them from 480i to 1080i by artificially adding the additional lines of resolution. They still look pretty good, and most of the episodes didn’t have huge amounts of VFX.

In any case, I recommend the upgrade if you can get it for $100 or less, or on digital platforms.