I have - I wouldn't know how sensitive the pregnancy ones are, they CLAIM to be more sensitive than pos types. I have some, so hopefully I'll get to see what a positive looks like this month! I was buying the OPK strips (not the POS, but the strips) through the website and discovered that the clearblue easy POS are MUCH more sensitive. However, what I've done is a combo of the 2 - I use the cheap ones until they start to really detect something, and then I use 1 or 2 of the clearblue easy to confirm. I did get a complete positive on the cheap strips once, but other months it would be almost there, when the clearblue would be positive. Also, I've bought from this place 2-3 times now, and each time I picked the fastest shipping and it still took about a week (I live in NY state) - just so ya know.
I've bought from there many times. The hpts are fine. The OPK strips can give unclear results. I've been getting their midstream peestick OPKs and have had great results and accuracy with them. So far, with the exception of my monitor, I like them over all sticks.
I bought HPT's from them recently - I haven't even had a chance to use them yet. But they were cheap and they arrived very quickly. Seems like a good company.