You get what you pay for.
I am a Raidfire owner and have also purchased many budget lights including P7's and MRV clones as gifts or on behalf of others.
The Spear is an absolute delight to own and use. I took a risk at the time and took advantage of the pre-order offer direct from Edgetac, but if I were buying now, and the choice was between the Cheapo, Raidfire or the DBS, I would choose the DBS because of the future upgrade paths. I am hopeful that Edgetac will offer the same when the time comes.
LED's and drivers are constantly advancing in terms of output and efficiency, and the DBS will actually save you money in the long run compared to the cheapies, when you can upgrade simply by purchasing a drop-in module instead of the whole torch. If you drop it and damage the lense or reflector, likewise a repair is cheaply made.
These companies offer after sales that are second to none. Compare this: The budget offerings may be work unreliably - if at all, have numerous sharp edges and poor anodising, rough threads with metal swarf, fingerprints on the reflectors etc, with no warranty except to send it back at your expense for a refund to DX or the Ebay seller.
Sometimes it nice not to make-do with second best. The cheap imitations have their place and can impress, but in my opinion, no one would ever regret buying either of the top two throwers.