I have those speakers; bought them back in 2006 or 2007. Considering they are PC speakers, they are pretty good over the entire audio range. The highs from the tweeters are not overly bright; meaning that high pitch notes are not irritating over time. The mid-range crossover, is a bit high in opinion, which means some of the mid range is missing, but the average person will not know that. The bass is tight enough considering they are only $150 speakers. Loose bass means low notes can sound a bit "watery" or muddied where they do not have much definition.
Well enough with my "audiophile" opinion of these speakers... These speakers are generally very good for listening to music. They are good for watching movies and pretty decent for games.
Unfortunately, the Klipsch Promedia 2.1 speakers costs about 10x more than the portable speakers the OP was interested in buying. Converted to GBP the Klipsch speakers are costs about £105 vs £11 for the portable speakers the OP is looking at.
Unfortunately, I do not have any experience with small portable speakers. If I am not using my laptop's speakers, then I am either using headphones, my Klipsch Promedia 2.1 or my Logitech Z680 speakers.
Since the Logitech Z120 speakers currently have 1,995 reviews with what appears to be a 4.5 out 5.0 rating, I would say go for it. The lowest price of those same speakers on the US website is $25 which works out to £17.25.
There are only 289 reviews with a 4 star rating on the US site vs. 4.5 star rating from the UK site. Perhaps the Brits have "lower standards" when it comes to appreciating sound quality... however, that contracts the fact that a lot exceptional audiophile speakers comes from the UK....