Any opinions on these? I like the Negra Cubanas so these interest me.

I have a few sitting in the humidor, but haven't tried one yet. If they are anything like the Negra Cubanas then I won't like them at all. I can't stand the Negra Cubana at all.

I was told they were similiar to the AF Sungrowns, that is why I got some to try.

Matt

I believe these have been around since well before the current interest in "SG" wrappers. I wouldn't comp them to either the AF nor the "other" Montecruz line extension.
This cigar is often described as having a "mild medium body."
At a good price, these are great everyday smokes for those who prefer mild, but flavorful cigars. I don't think someone who likes mild cigars would be turned off by them, but someone who's interested in a more robust SG experience might be disappointed.
My 2c

they are tasty and different with a little bite. you could do worse for the money. Worth it just for something good but also a change , however not an everyday cigar to me.