I'm with you on the PorttiPotti and my wife agrees, so much so... that she wanted the deluxe version with the electric pump for the water flush (so, she bought it). If I were to use the forest, I'd still want to pack it out.
I've had one for over a year, many dumps and refills and am still operating on the original AA batteries (I think it takes 6 of them). Still a very strong flush of water.
It's the Thetford 465.
I tried buying it from Amazon, however, they TWICE sent me the "Marine" unit (Thetford 465 MSD) that doesn't have the same dump feature as the one for "RV's". The 465 MSD is designed for dockside pumpout hookup. In this specific area Amazon has the wrong warehouse code for the RV Thetford 465. If anyone goes this way, don't try buying it from Amazon, you don't know how many times I went around via emails with Amazon. Excellent on refunds and trying again, but when the warehouse code is wrong, the wearhouse code is wrong.
I got mine from Cabellas for $135 and free shipping, however, I don't see it on their web site anymore.
AdventureRV.net has it for $119.99, plus the shipping cost.
If the electric pump ever goes out, my wife will probably just buy another complete Thetford 465 as the electric pump is not really available from Thetford as a replacement part. I tried to purchase an extra for a backup from Thetford Replacement Parts division, just in case it goes out while boondocking, however, no such part according to the nice guy on the phone and we could both see it on their web site... go figure. Interestingly enough I can purchase the electric pump from an RV place in the UK and I do have friends that will send it me in the U.S. (the UK RV place doesn't ship to the U.S.), but add up the hassle for my friends, the extra shippng costs and the delay in time, probably not worth it.
The wife "unit" has been advised that we'll be pouring water from a cup to flush, if the electric pump goes out while boondocking and she is OK with that.
So far she is very happy not having to manually pump to flush, and when she is happy, I'm happy.
FYI potential new Raven orders. The 465 doen't fit the Raven. I was told that it would so I ordered it but it doesn't go in