I have to take issue with the comments above, which is flat wrong. Schiit makes fantastic amps and preamps. The Vidar will drive anything in stereo mode, and plenty of people use two of them as mono blocks. The Aegir was listed on Stereophile's A listing, which is a very exclusive award. The Aegir, being 20 wpc, is more suited for more efficient speakers and such, depending on whether you want rock concert levels or more reasonable uses.
The Freya+ is a major accomplishment for its sound quality. Being that it also has tubes and passive modes and true balanced inputs/outputs basically turns the audio industry on its head. Find any preamp that has this fully balanced circuitry, then look at the price.