i was browsing through aliexpress and to my surprise i noticed a mk42 heatbed clone for £36. So i was wondering if anyone has purchased this before and if so is it any good?

[www.aliexpress.com]

Yes I bought one to replace a MK3 heatbed for my Prusa i3 rework 1.5. I am very satisfied.
Fast delivery, good temperature rise.

I recommend you the Orballo MK42 heatbed. The bed from orballo is made in pcb fr4 3.2mm like the original. Be careful with the aluminium mk42 heatbed from aliexpresss. With aluminium the autoleveling dont work really well and of course will not work the XY calibration. The quality of orballo mk42 heatbed is the same as original. The shipping was really fast. [orballoprinting.com]