I've had my 12T HF press since 1986 (26yrs).

Just used it last week to press off all the pistons from the rods of the 3 core motors I recently tore down. Worked great.

The bottlejack/pump has an override/relief valve that won't let you over extend itself.

Only caveat I'd mention is to get the 20T for the extra grunt and remember that heat is your friend when using a press. Along with a big hammer. to shock a pressurized load.