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I bought this shaver as my first electric - and not knowing if i was going to stick to dry-shaving I thought I'd go for something basic. I had used braun a couple of times so thought I'd stick to this trusted brand, and went for the Series 1 150 because it is one of the cheapest options.
The shaver is very easy to use and maintain. It charges simply using a shaver socket (so you may want to invest in a mains adapter for shavers if you don't have a shaver socket). It has simple cleaning instructions and comes apart fairly easy for this purpose.
There is a power indicator light for using as well as charging and a full charge will last quite a while. I use it every 2-3 days and have to charge it about every month. This is useful because you wont usually have to take the charger with you if you go traveling.
In terms of performance, although I don't have many other shavers to compare it to I would say that it performs well. I have heard people say that this shaver 'pulls' hair but I haven't experienced this. Obviously there are times I have to go over areas, it is by no means perfect, but when you consider the price this is a minor inconvenience.
The only problem I have with this shaver is that it only has one hair trimmer, and so you have either the close shave or the slightly less close shave - it doesn't cater for leaving your facial hair a bit longer, so if that's what you are looking for then look elsewhere.
Overall I would recommend this shaver, but bear in mind this is coming from someone with pretty basic shaving needs - I'm sure that if you pay for a more expensive shaver with quadruple rotorary technology and anti-gravity precision blades or whatever then it will perform better - but I personally think this shaver works just fine!