I failed to have e-mail notification on and never saw these replies.
I purchased the X-Sweeper and returned it for the Xplorer for these reasons (Optielectronics has been great in this regard);
1. No carring case. For $1600, a case should be included especially considering the size (4x larger then that Xplorer).
2. Can't recharge the batteries in the unit. You need a screwdriver to remove the cover just to charge them. The reason I was given was, unlike all their other models, this one can use alkalines. Why carry a spare set of non-rechargeable cells around when for about 4x the price (of alkalines) you can have rechargeables instead. No different than deal;ing with digital cameras.
3. But, mostly PRICE (for what you get over the Xplorer).
What isn't in the specs, the X-Sweeper has a preamp built in that the Xplorer doesn't.
I do have a counter (UTC 3000), but that doesn't seem to make the grade. It seems to take longer to 'lock' to the frequency. I haven't really 'played' with the unit long enough.