Right away, you need nothing. I chose to add different accessories for varying reasons. A Freak is a real good investment in my opinion, it allows you to shoot any size paint, and matches the size of the ball for good accuracy. Warp feed, it's sweet, never have a problem with it, and man it rocks... but it is pricey.
1. ROF - yeah it is capped at 13 in its multi-fire modes, but in semi, it can go as high as 20 bps. The marker shoots WAY FAST, even with a slow trigger finger, it is easy to bang out 8 or 9 bps. This cannot be stressed enough, the LCD is FAST FAST FAST.
2. Accuracy/Range - I have (and swear by) a Freak. It provides superior performance to the stock barrel by allowing you to fit the barrel directly to the paint. It also allows you to shoot any type/size of paint big ball or hellfire. The Freak is also pricey though. The stock barrel (an Infinily Jacko) is decent for a stock barrel, and I have teammates who still use their Infinity barrel, so replacement is not absolutely necessary, but I have found superior performance with the Freak.
3. Low/No Maintenence - You put a couple drops of oil into the exhaust port when you first get it, and that's it (then wipe the bolt after you dry fire it a few times). To clean it, wipe it down with a damp cloth. Occasionally you'll need to charge it, but the charges last a long time.
4. Reliability - It shoots, and not just sometimes, it shoots EVERYTIME. You take it out of the box, adjust your velocity, and shoot.. it works, it always works, and is the most reliable gun I have ever owned.
5. Style - I am not into buying guns for the style or intimidation points you get from them, however, I get tons of comments about the LCD.
1. Ok, the bad.. I can think of 1150 bad things about the LCD (it cost me $1150). The gun is expensive. If you want to accessorize it, expect to spend a couple hundred more.
2. The little buttons on the handgrip are difficult to push if you wear any type of gloves when you play. This is a huge pain in the ass. I recently was told that Custom Products makes buttons (nickel plated) that look better than the red, orange and green AND they stick out a tiny bit further, making it much easier to push the buttons.
3. The breech knob, the LCD comes with this little plastic P.O.S. breech knob. Mine stripped off the very first time I opened the breech. They only cost $12.95, and I got a matching annodized aluminum one from KAPP, but you would think that when you spend $1150 on a marker it'd have a good knob. My teammates have no problem with their breech knobs.. maybe I just got a bad one, it happens.
4. WDP Minireg, it is too short for a good grip (I'm a big guy). Understand I am REALLY nitpicking here.. the mini-reg works for everyone under the sun, but I thought it was simply not for me.
I have shot and compared my 2k1 LCD to virtually every other tournament level marker out there, in particular the IR3 and GZ. I recommend the 2k1LCD, it shoots amazingly fast, accurately, and it ALWAYS WORKS. It is comfortable, and chic. Plus I never have to do anything to maintain it. Prices are dropping on these puppies, pick one up now. Also, on a related note, everyone who complains about chopping paint should understand you cannot set your Maximum rate of fire (MROF) faster than your hopper can feed you, or you risk chopping paint--end of story. I have a warp feed.. I can't outshoot it, I don't chop, skip, hiccup, or anything. It is awesome. If you use a 12v revvy.. set your MROF to 11 BPS and you won't chop a thing. This is the only marker I have ever owned that I can say I am completely happy with--it is truly deserving of the rating I gave it