i have 2 and they have no use from me so i sold the 1mb ram i found in the trapdoor. i nearly got the same price as a new one from amigakit! it would have been a huge upgrade from a 48k spectrum if just for the keyboard! but i had an st.
as far as whdload... if i look at the "quit key" dialogue when it boots up it tells you that the key can be f10, printscreen and there was one other. have you seen this? there maybe others you need to press to quit? keep an eye at the bottom of the blue start up screen of whdload!