I think any kind of lift is helpful/almost necessary when working on Porsches. It seems like everything comes out the bottom. When I first got into the boxster, I use to drive them onto my trailer to work on. I would then back the ass end out over cinder blocks and 2x10's. Even then, I would still have to jack up the rear of the car if I was removing the motor. That's probably the biggest hurdle about working on the Boxster. You have to get the car 3-4 feet off the ground to get the motor out. I finally found a like new lift on Craigslist. I would have bought any kind of lift at the time. The one I found happen to be a four post and I'm so glad it's the kind I ended up with. There's pros & cons about whatever lift you end up with. For me, the biggest pro of the four post is that I can move it anywhere on my slab. It seems like I move it around as many times as I work on a car. You can't really do that with most two post. Two other things I like about my four post are I can drive/push a car onto it and get working right away and there's somewhere convenient to put your tools. There are times where I wish I had a two post too, but there hasn't been anything I've come across that I couldn't do on my four post.
I've taken the motor and trans out of 12 boxsters, 1 996 and a 2000 Camaro using this method. The front wheels are chocked and there's a cable keeping the car from rolling back