I just put a set of the Delta Blues in my Squier Standard Strat. Not because I wanted cheap pups for an inexpensive guitar - but because this guitar is my favorite strat ever and I wanted to treat it right. These are the real deal.
Harpmaster is a regular over at agf - just go over there and you can get loads of information about the pups. There's lots of demos to be found, too. When he first started selling them he passed a few trial sets around and let some members record demos with them. They're VERY impressive. Seriously, boutique quality for short money.
The reason you've never heard of them is probably because he's only been selling them for a few weeks. This is the time to jump on them, I think. But like I said - head over to AGF and you can get more details than I can give you here.
Just got a set of the Jimi's for my strat today in the mail... review to follow. Pups look great and shipping was fast. Can't wait to upgrade those Tokai pups.
I got a set of his Modern Telecaster pickups in my SX Furrian with Fender Pure Nickel .010"s and it sounds wonderful! Warm, clear powerful tones. Still has the Tele Jangle, but can turn up the crunch pretty good. These are not a vintage tone, but that isn't what I was after with mine. He has a Vintage set, that is all the rage over on AGF.
I've had them in my Tokai AST56 for a week now... and these are great sounding pickups. I used to have a 70's strat and these have all the big fat 70s strat tone that I loved. I have an old ESP 400 series MIJ strat that is probably my 2nd favorite strat and these even sound better than that set.. sadly kind of make the ESP seem a bit muffled. Excellent pickups IMO... very clear, yet bold and fat. I liked so much I'm now waiting on a set of Harpmaster humbuckers for my Tokai SG..