I have this product,would highly recommend.

Great product.

Holds charge well, and comfortable to hold.

Only issue being the comb's are prone to break and are virtually impossible to replace.

Heat given, although an alternative is this, which I bought as a replacement. Brilliant little clipper.
http://www.argos.co.uk/product/4123770

I've been through a lot of shavers over the years and this is the best yet. Holds a lot of charge and I only charge mine every 3 or 4 uses.

I havn't shaved since I got their previous model a few years ago. Really really really recommend them.

DIY?

Have this it’s very good, the only thing is when the charge runs down there’s no slowing down, it’s just stops. Only a problem if you're half way through trimming your beard.