We've had this seat for two years. Here's my experience:
1. Installation. Takes some time, but the instructions are good. It's one of those installations that after you install it, you say to yourself "is that right?". However, I have shaken this seat HARD many times just to make sure it was attached solidly. It is.
2. As for the assertion regarding "Seat can be removed from rack in seconds for solo rides". I guess you can measure a flight from New York to San Fran in seconds, and no, it doesn't take that long to remove the seat. However, this seat has three long small diameter bolts. It's difficult to get the leverage to tighten them down by hand, and just as difficult to remove. Also, the seat cushion adds to the difficult of getting under it to screw the back bolts. Feeding the bolts into the rack can also offer challenges. If you leave the seat on all the time, you'll bypass this challenge.
3. Now the reason we decided to get rid of this seat. We have two child. When I'm riding behind the wife, I often ask her to stop because the seat looks like it's about to come off. Anytime my wife hits a bump, the seat sways a lot. I shake it hard again (see the trend), check the bolts, the rack, etc. The seat is solidly attached, it's not coming off. My guess, because there are no shocks for the seat, anytime the bike shakes, the seat has to give somewhere, and it looks like the seat is going to come off. The wife and I were biking in DC and a cyclists past her and said "is that seat installed correctly".
Even though this seat is attached correctly, I don't trust it because it always looks like it's about to come off. We just bought a Topeak child seat which has shocks on it, so it cushions the ride and doesn't swaying excessively. I'm about to buy another one for my bike. It literally is a seat that takes seconds to mount and unmount. It's twice as much, but I feel more secure using the Topeak seat.