Simple answer is yes, its a good deal and a fine power supply.
New you'd be spending more to get a made in china supply with it's interface and build quality issues.
You've made no mention of the condition, reliability of the seller or test/return policy so all comments are added with that caveat.
As you're just setting up a lab spending the smallest amount possible until you really understand why you need feature x is a good idea. One you know you need a power supply with a certain number of Volts or amps or programmability then you'll be convinced of the value of individual supply. For the first one, a couple of amps up to 20V seems reasonable so the Agilent is probably overkill in terms of features but you'll use it for a long time. If you can afford the 150 quid without sacrificing on other equipment like a multimeter or 'scope, go for it.