Alan,
I managed to get hold of an original Bruce 5kg on ebay and it is far superior to the clones available .It is a pleasure to use and holds well.
I also have a Manson Supreme 7.5kg which was originally my main anchor but the Bruce has relogated it to standby for the following reasons
1.It is lighter and does the job and trips easily.
2.The Manson holds incredibly well but I have found difficulty dislodging it on occassion .It comes with a sliding shackle setup which should make it easier to break out but i have not found this particularly effective so have rigged a very ugly messy trip connection which now works but needs tyraps replacing regularly.
If you can find a used Bruce original go for it may be a little more than a new clone but it is thinner and sharper and stronger and works great in the bay.
Peteg