I use the Centech, pretty much the entire 5 years or so I've been detecting. I did use the best pinpointer of the time (Garrett ProPointer), but it was prone to failure, gave false signals all the time. Customer service was amazing, but the sent a replacement with the same flaw, and was useless about 6 months later. Never sent it back, for a second chance a getting one that actually worked, just stuck with the Centech, never fails, still going strong, does what I really need. The Centech isn't perfect though, not as simple to use, nothing automatic about it. Takes a little while to learn to set the threshold (trigger point), to get best depth. Need to check and see if it still set right occasionally. The case isn't really sturdy, have to be careful. It's really more of a wand, as I suspect most pinpointers are intended. Many people think the more expensive ones are probes (shove them deep in the dirt). Never could bring myself to abuse my $127.50 ProPointer like some do, guess it really didn't matter in the end...
There are a few good threads here about modifying the Centech. I was ready to fix mine, before it arrived, before I put the first battery in, I had it opened up. Replaced the switch, didn't like the idea of a pushbutton you had to keep pressed while using. The beeper is very loud, didn't want it to alert every on around, that I found something interesting (come watch my glory, ask bunch of questions). So I replaced the beeper with a vibrating motor out of a pager. Didn't cost me anything, I do electronics as a hobby, and salvage parts. The modifications don't really require and special skills, little soldering.
You can learn to pinpoint with your BH, and know with in a n inch or two, where your target is. I plant a small plastic stake right over my target, as I'm setting down my detector, so I don't loose sight, or get confused, as I breakout the digging tools. I don't mess with the pinpointer, until after I dug the plug, don't always need it, target is visible. I always grab my detector, stand up, rescan the plug, and the hole, in hopes for more, or atleast something better than the target I retrieved.
Pinpointers do help speed things up, takes a lot of time, lots of plugs and gouged targets, before you learn the skills of pinpointing with you main detector, but it's a good skill to have. There are a lot of targets, which have a potential value, much greater, than melt value of the metal. Some people don't care, rather just go for volume melt, and rather not know. Personally, I'd feel bad, gouging something really nice, in my haste.
The Centech is a good value, cheap and reliable. Might not be the fastest, fanciest, easiest, but you won't cry over losing it, breaking it. Took about two weeks from the day I sent in my Garrett, until I received the replacement...
Another good reason for a handheld, there are sharp things in the dirt, so less contact (groping around) you do, less chance of getting poked, scratch, or cut. I don't like wearing gloves, but they could help some, but have to be pretty heavy duty to stop it all.