I built the HF Projects LPF100 low pass filter (which is used in their amp), to include in my home brew TX. I was struggling to source silver mica caps, otherwise I would have scratch built one.
There are a couple of shortfalls with the LPF100, firstly the performance is lacking on a couple of bands, on 160m the 2nd harmonic attenuation is marginal as is the 2nd harmonic on 5MHz. Maybe I am being a bit fussy...
The PCB has some very narrow tracks, if you need to remove a component there is a high likelihood of damaging the board.
Finally, the coil winding is ambiguous. Wound as per the instructions the results were poor. I measured the passband on my spectrum analyser and ended up rewinding a couple of coils. Hence the reference to delicate tracks in the last paragraph.
I am not a novice builder, or solderer, having built many projects over the years and worked to component level servicing for 20 years in the mobile radio industry. But I'd opt for scratch building if you can source the parts.