Worth £50 any day of the week if its in working order imo.
We have a few Rotabroach ones, which are always picked up first, they are far better.....
Those ones, as with many of the cheaper ones, the spring isn't as strong as it could be, meaning more downtime getting the slug out... and also the magnet isn't as good as the higher end machines. Don't get me wrong, it serves its purpose and drills holes okay. Runs a bit fast for bigger cutters, 26 is just about alright, but its ideal for 14/18 imo.
The quick release chuck can be a pain to release if who ever used it before hasn't put the bit in properly, not really a problem if its your own and just you using it.
Unibor is a good make if its that one EQ30/EQ35? We have one and can drill upto 50mm. I like the quick coupling system on them beats allan keys any day. I think they are about £700 new. Without looking at it I think its made in the UK so parts should be ok