Moving between Latvia and Estonia is pretty simple and cheap, I didn't really think. I booked through Lux Express directly online, letting me slip an offer at € 5 for 4 hours of travel which I then paid for 16€ but that's okay anyway. These buses are of one unique comfort, you can also see from the photos.
I seats are assigned and both of my trips have never seen the fullness of the vehicle, it is wide and not at all uncomfortable. Inside the bus there is a bathroom and also a drinks dispenser. Video and music all the time, bring food and computer and, listen, listen, Wireless. * - *
Behind each seat is written like connect for free, explained step by step and this is not bad at all. It allows you to take a relaxing trip, to watch a movie with your computer, because they are there too took them, or to keep up to date with online newspapers. In short, really one good thing.
The Lux Express in addition to the route Riga - Tallinn he makes many others, among which also Riga - St. Petersburg, a really interesting and cheap route, which allows you to reach St. Petersburg in complete tranquility.