Maxxed out the force on mine many times.  The wimpy bolted-on feet allows the jack to tip 
forward under max force.  I like STAN1's welded feet, above. 
This is the first I have heard of the cast plates breaking.  I use a plate of 1" A36 steel on top of them
many of the times I use it.   I will prob do that more.
I have the 12T pipe bender (15yo?), which is not so useful.  Cost less than $100.
Sometimes, I wish I bought the 50T or 35T instead, mostly for the higher force and bigger
frame.  The air-over-hyd is a nice option some of the time, but I like the feel I get from
manual control.  I have a free-standing 20T air-over-hyd jack ($75 on sale), and I like it for 
what I use it for, but it does not have fine control.  I DO like the winch lift for the table.