I wouldn't worry too much about what other people think of the Conquistador. It's what you think and how you feel about it that matters. Are you happy with its performance? Do you enjoy using it? Does it cope ok in the areas that you hunt with it?
Tesoros and the X Terras are like chalk and cheese...very different, but both work ok. You should get some idea from your X Terra 70, which has ground balancing facility, whether or not you need a detector like the Outlaw, which also has manual ground balance, whilst the Conquistador has a fixed pre-set ground balance.
For example, does your X Terra 70 get more depth than your Conquistador, and is its target identification more accurate. If so, then a machine with manual ground balance might be very useful for you. I'm aware that your Conquistador does not have visual ID, like the X Terra 70, but by using the discrimination scale on the Conquistador, you can determine whether or not it is accurate in its identification of targets. Good Luck and HH