Nex(t)us on your list...Nexus Sr. is by far my favorite cock, and has become an essential item in my toy box! It's decently easy to use, and though it does need a harness for more serious fucking, it has an amazing array of uses that go beyond conventional strap-on sex, such as pack-and-play and blowjob fun! An essential product for any gender play or strap-on enthusiast!
It has a very natural fit for me and is very versatile. I have a vagina that is on the smaller end of the spectrum and cannot take very thick toys; however, I found the fit of the smaller wearer end to be absolutely perfect and the curve is such that it really does hit my g-spot every time. The larger end is one I rarely receive without lube or foreplay, but it isn't out of the question for me to be able to take it. I also like the length of the larger "giving" end because it allows one to build up a nice drive while fucking.
I find, however, that though this is a wonderful toy and I adore it, it is most definitely not "strapless" and you will need to purchase a harness (which can be a bit tricky as it needs to be backless; I chose the Renegade Leather Harness and it works decently well). If you are looking for something to stay inside you with no hands or straps, this isn't really it, however, for me, this isn't a problem, since it stays in well enough for simple foreplay (on one's back) and I usually switch to a harness when I want to fuck. However, one thing that I have found is that Nexus Sr. can, with practice and care taken, be used as a pack-and-play cock by wearing it with a harness and tucking the head of the toy under one of the straps. It is certainly not subtle, but it can be done and for some that is a very fun route to take! I have also found it lovely for blowjobs as one can often feel the movements of your partner's mouth more acutely due to the double-endedness.
However, despite the flaw of not being very "strapless," Nexus Sr. excels in plenty of other ways. The ridges on the wearer's side are expertly placed, and I have found that they stimulate my g-spot very nicely! The base of the toy (connecting the two ends) is also very well proportioned and can be used to stimulate the clit while fucking without a lot of maneuvering or angle-changing.