Well, just received the replacement (re-purchased) 128GB Zif PATA SSD for my HP 2510p - the Pro IV part RCP-IV-Z1828-C

Cloning went well -no USB microslave on the new model, but better instructions i.e. some on installing it the caddy provided.

Up and running, doesn't seem to getting hot at all - will run some soak tests overnight.

In terms of performance - the stats from Crystal DiskMark are better:

Seq Reads up to 81.40 MB/s from 60.30 MB/s against original HDD of 13.22 MB/s
Seq Writes up to 61.55 MB/s from 47.40 MB/s against original HDD of 12.06 MB/s
512k Reads up to 72.40 MB/s from 60.83 MB/s against original HDD of 9.649 MB/s
512k Writes up to 62.34 MB/s from 39.45 MB/s against original HDD of 7/963 MB/s
4k Reads up to 14.65 MB/s from 10.00 MB/s against original HDD of 0.196 MB/s
4k Writes up to 8.072 MB/s from 2.043 MB/s against original HDD of 0.343 MB/s

So the overheating Pro III device will be going back to MemoryC in the morning, under Warranty, and refund given.

If the replacement device can maintain these speeds, without any of the overheating and BSD I will be delighted.