Got these on sale during the TW Fila sale (50% off!). Speed Serve = SS, Axilus 2 = A2. For reference, the Lotto Raptor, KSwiss Supreme, Diadora Blueshield 4 half a size down, GP Turbo half size up, Yonex Sonicage 2 (2E) are all shoes that generally fit me well.
Fit. Pretty similar to the A2. They both have Fila's somewhat odd, shortened length, but the SS is a little wider with a bit more softness on the inside, so the toe box is slightly more comfortable and less bare feeling than the A2. While the extra room on the SS is great for the toe box, I felt my midfoot had too much to move around, and the lace system feels a little narrow. I don't feel quite as secure, but when doing lateral movements in my house, it didn't necessarily slip around that much surprisingly. I did immediately change the laces to a runner's knot, so that definitely helped tighten up the uppers. I might add another runner's knot to the mid of the shoe. The SS has less heel slippage than the A2, one of my major complaints with that shoe. There are still other shoes that feel more secure, but it's better. They seem to have added a harder heel counter, which helps a lot.
Comfort. The SS forefoot cushioning is a little more than the A2. A2 is definitely an on-the-ground feeling, and while the SS isn't super plush, it doesn't feel as raw. Heel cushioning is about the same, that is to say nice and bouncy. Tongue seems a bit more plush, can't feel the laces on my feet. Uppers are supportive without feeling too rigid or creating any pinching.
Durability. Can't comment as I've only tried these on around the house. The extra layers of wrap around the inner side of the big toe is nice, hopefully it doesn't tug on the texture. Like the A2, Fila pulled the outsole up to wrap around the side of the shoe a bit (you can see the tread pattern), so that was a nice touch for some peace of mind. The laces aren't my favorite (I wish they were bubble instead of uniform), but they solid and are far better than the super soft ones on the A2 which just fall apart. I am a little nervous about the top two eyelets for the laces though, as the material seems quite thin.
Performance. Again, can't comment. Like I said, the wider fit makes me a little nervous, but it doesn't seem to be as big an issue as it feels. Surprisingly, these feel even more stable than the A2. A2 was already a stable shoe, but I think the extra width on these shoes gives a slightly wider flange for additional support. I put my A2 against the SS, and indeed the outsole comes out a little wider. When trying on shoes, I always walk on the outside side of my feet to see how wobbly they are or how easy it is to rollover, and it was very hard to do with this shoe. Outsole is quite sticky out of the box, but I imagine they will smooth out like the A2 did. They are supportive and cushioned without feeling heavy. I think Fila struck a really great balance with this shoe.
Ventilation. I left these on my feet for awhile to see how hot they get. Some shoes burn my feet up quite quickly, but these passed the test. If you look closely, there is a decent amount of ventilation throughout the shoe. I'm not worried about these shoes getting too hot.
Overall, these shoes seem great, especially at the price I got them. I'm surprised they didn't sell out. I guess Fila is less popular. Handsome shoe, not heavy but supportive, seem durable enough, comfy wide fit, well-balanced design.