I like it, it's on sale for $159. There is another maker the hml350 that I've seen two versions of, one metal or aluminium I should say, and the other with abs plastic, one is 82G and the other 53g respectably. I really don't think 2oz adds that much weight, I also would have to see evidence that widening the antenna in horizontal attitude lowers signal strength. I'm not saying it doesn't, but just the same it could actually make it better. Without real world tests I just don't know. By the way these newer kits are $72-$78 eBay.
Now the bad thing about these kits it are they actually for the P3p/A? They say they are, but so do other things on eBay that clearly are not but state they are. The other thing I personally don't like is ability to control the hml350 with the PAF switch, this kit is automatic and is said to be user set, from manufacturer they are said to be at 5m, to be sure 5ft sounds better to me as I fly low sometimes but 15' might be a Better choice. I just can't find any video or install directions to see the harness connection points and final kits "ergonomics" and fit quality. On top of the added (less then) 2oz weight gain, there is a constant pull on the battery for the servos to stay "locked" . Some type of system that didn't pull constantly would be ideal, use springs and a notch or something a servo could overtake once switched or something.