Horses for courses, you can spend a lot of money on a new laptop and it be an ogre from hell, or a used one and it be an absolute gem!
My first laptop was bought new, (£500) Toshiba 17" Satellite running Win7, on-board graphics, bit of a pedestrian dog, but used that for around 3 years until the boot files got corrupted because the CMOS battery went belly up, they're hard wired onto the motherboard and replacements weren't available, wouldn't touch Tosh again
2nd Laptop was an Acer Aspire 7540G 17" running Win7, bought secondhand from Cash Converters about 5 years ago for £200, still have it and use it as a hack for running old Windows software, 2GB (shared system memory) ATI graphics and 4GB system memory, pretty quick but got noisy running CPU intensive programmes despite cleaning the fan etc, an SSD transformed the beast but still too noisy for frequent use in the house,
3rd laptop is a Sony Vaio Core i5 with 2GB dedicated graphics running Win8.1 (declined Win10 because it kept breaking my WiFi plus I want control over updates – I use a mobile dongle in France and costs a fortune), bought secondhand from Cashconverters a couple of years ago, in mint condition for £300, swapped the HD for a 500GB SSD (£120) and boots into my login screen in 2 seconds, runs as quiet as a mouse and very fast,
If you buy from a secondhand outlet such as Cashconverters, they always wipe harddrives via system reset, the bogey is they also load their company software too, so their name plastered all over the place, a dedicated Windows reload using a Windows disk and the OEM installation key wipes it clean, they also come with a warranty, which was 3 months in my case, if they're going to break or turn out bad, you'll know pretty quick and you're able to take them back, I've never had a problem,
Would I do it again, definitely!
What I would say, if you use programmes such as Photoshop, Paintshop Pro or any CPU intensive 3D graphics or other similar programmes, Absolutely only buy one with a 2GB dedicated graphics card with at least 4GB system memory and the best CPU power you can afford, laptops are almost impossible to upgrade compared to a tower, and 'on-board Graphics' cards use system memory which can leave the CPU or the graphics card gasping, I learned that the hard way.
If you're inclined to go for a refurb, it may be worth you looking at the 'Dell Outlet', site, it's pot luck what's available because it depends what they get in stock and they sell out fast, but there were several very well specc'ed core i7 laptops with dedicated graphics and a lot of memory for not a lot of money when I was scouting around, had my Vaio not turned up when it did, I'd probably have bought there.
John.