Not for me, not really. There are some that feel better than others, but I find that shape has a lot more to do with it than length/girth.

I can't do more than maybe 6.5'' or it starts hitting my cervix. I prefer a girth of larger than 1''.

I would consider the ideal cock dimensions to be the ones most likely to be a crowd pleaser, the cock that I can take with me when the preferred quantities are unknown, the cock that I can start with until I've established with my partner that they prefer something larger or smaller.

So far, that dimension is 6" in length and 1 and 5/8" diameter. In other words, the exact dimensions of Silky.

About 4" to 4.5" is usually the longest I can take, maaaaaybe 5" if I'm very aroused. Girth depends on how rigid the material is. Something really squishy can be around 1.5" in diameter, while a medium firmness would have to be 1.25". And when it comes to hard things like glass and plastic, I'll rarely attempt to go over 1".

I prefer around 5" circumference and 5-6 inches of length. I can't fit more than 6 inches.