The shelter is a fine cartridge for the money but it does not have the refinement and top to bottom balance that the ruby does. If you have the shelter in your system you could be perfectly happy forever-unless you put the ruby in and hear the difference. This is a pocketbook decision. Remember it's about the music and one can get hung up on incremental improvements. Not to mention going broke. Spend more money on records and less on hardware is my motto.
