Season 4 is out in the UK now and it covers 3 whole sagas including the Garlic Jr, Trunks and Android sagas. There's plenty of action and some really great moments like Trunks arriving for the 1st time and turning Super Saiyan to battle Mecha Frieza and King Cold. There's also some great fights like Goku vs 19 were Goku almost dies from a heart virus, Vegeta vs 19, Vegeta vs 18, Piccolo vs Garlic Jr plus some great training scenes with Vegeta training under 400x earth's gravity. And the whole battle on Kami's lookout with Gohan, Krillin and Piccolo against Garlic Jr and the Spice boys is also great.
It includes English voices with the option for English music or Japanese music and Japanese voices with Japanese music. Once again I recommend watching it in English with the English music for the best experience.
If you love DBZ then get this.