It's been a while since I visited the GLOSS website. For the past few months I've just been watching Arabic TV shows, but when I saw it yesterday I noticed that it now has Arabic dialect lessons! There are lessons for Levantine, Iraqi, Gulf, and Egyptian. When I looked at the Levantine lessons the first few I went to were all recorded by someone reading something that was written down. The way people read is a lot different than the way they talk off the top of their head with nothing to look at. Talking is a lot harder to understand than reading since talking is usually a bit jumbled and not so proper. Even natives make mistakes when they're talking. Things being read are great if you're starting out on a dialect because everything is really clear and spoken slowly so you can hear every syllable and learn new words, however if you only ever hear speech like that (slow, clear, meant for learners of the language) then you'll have a lot of trouble with fast everyday speech spoken between natives of the language.
There are also authentic materials from the media on GLOSS though, so you'll find something that suites you. And best of all there are transcripts of what is being said. That way you don't have to wonder if you're hearing the word correctly or not. Some of the audio is very distorted and low quality which is good for advanced learners in my opinion, but if you're just beginning it can be frustrating. If you find a clip where the audio quality is bad you can click the button at the bottom labeled "alternate audio" to get the audio of someone reading the text. I used GLOSS a lot when I was studying MSA and now that they have dialects I plan to go through all of those lessons too. I don't actually do the lessons. I just open the audio and transcript and go through it until I can hear and understand everything. If you want you can go through the questions they ask, but personally I haven't found them to be very useful. GLOSS is also starting to add videos with transcripts and they have 22 right now for MSA, but currently there are no videos for the dialects.