How is it compared to the Ace 250 ,350 and the At pro? I was going to buy the At pro but i found a vary good deal on a slightly used Scorpion and decided to buy it to use as a back up but now im not sure that i even i need a AT pro now that i got this? If i can lean to hunt the Scorpion by sound is the AT pro going to give me more then a fancy screen?