I have the Procat, had it for years and it's never let me down. I bought it 2nd hand and it came with a hopper extension which simply sits inside the existing hopper. Without the extension the boat holds around three quarters of a kilo. With extension I can double that.
It's all the boat I'll ever need, quite fast, steers and handles well. Here's a tip. I bought a large plastic-coated hook and welded onto it a 3/8ths BSF set pin (bolt). I can screw this into a spare landing net pole to lift the boat into or out of the water if the bank has a bit of a drop to the water.
Another tip. When first using the boat to take out your terminal tackle, lead, hook etc DON'T make the mistake I made. I didn't open the bail arm on the reel, relying on a loosened clutch to allow line off. Massive line twist was the result!!! I learned my lesson, trust me...……...
Ian