I tend to pick and mix quite a bit myself.
I have a 36 ft powerpole from Omnipole - just for certain jobs (usually cladding) as it has some weight behing it. Also, although it is a heavy beast, it can be Ok for highish windows on a windy day that carbon would struggle with.
My van mount (delivery unit with just resin) is one of theirs too. I like the fact that they are made in a way that makes them easier to tinker with myself. Also, I prefer the "return to tank" method rather than needing to mess around with electronic flow controllers and the fact that they use flojet pumps because they seem to outlast sureflo (just in my experience).
As for poles, I have quite got to like the Gardiner 25ft SLX since I had it refurbed and those allen key clamps were replaced. It feels like a far superior pole since this was done. I avoid gritting the inside of the pole by using the hose externally. To achieve this without it regularly popping off the y piece, I bought some pole hose the next size up from the one supplied as I can push it onto the barbs further. I do get a few more tangles but I prefer this to the alternative. The tangles reduce with time as you get used to working that way.
I'm gradually switching to Gardiner lightweight brushes on all my poles (except Omnipole's offering because it's a different type of gooseneck). I also have a couple of 18ft Ionics multipoles which will be getting Gardiner brushes when the original brushes have had their day.
As things have moved on in recent years (mainly due to Gardiner's offerings), I have been left with bits of poles etc that are very usable, far too good to throw away, yet wouldn't fetch much money if I sold them second hand. So I just gradually use them up until they reach the end of their usable lives.
The RO on my static unit is a merlin. The 300 gpd wasn't giving enough water at the low pressure. I couldn't trust a pumped system because it let me down once and the tank overflowed on someone else's property (I believe the cut out switch had dirt or scale in it). So I needed more production without the need for a pump and without costing the earth. A merlin ticked the right boxes.