Full disclosure...I have owned several and shot everything in the KelTec Line. I like them and I have friends who work at KelTec and I sponsor their 3Gun shooting team. I have 5 of them now, PF9, Sub2000, RDB and honestly, I think those are some of their better offerings. The PF9 is NiB coated, runs like a champ, but I will admit it was hand selected. The Sub2000s have some sight issues, but they are fun, accurate and have some interesting features. The front sight is just terrible in design. The RDB, rail screws came loose requiring me to locktite them. I have been running the prototype magwell for the RDB and it really improves the reload speed. The RDB is not very accurate, but it is very compact and has a decent trigger. For me, it ended up being a good choice for my Gemtech Halo.

The RFB, I would not own. There are just too many issues, and .308 in a kind of a one-off configuration with all proprietary parts.

The KSGs are pretty cool and offer a lot of on-board ammo, to me it is a niche gun and not the first choice for anything except coolness maybe. That is not to say the ones I shot had any issues, just not my cup of tea,

They do have excellent customer service, which for many mitigates the issues with any of their guns.