Precision BMW Repair

Horrible, worst service I ever witnessed! Research the BBB if you have any doubts! I was with my friend through all of this and kept telling him to stop bringing his car there. My friend never had to consult a lawyer about service and harassment in his life before, absolutely terrible service and the guy has no time to answer questions once Derek has your money to pay for his flying lessons!
I noticed once anyone leaves a poor review on this midgets shop the kid goes ballistic!
There webpage looks like a big shop with a lot of experienced workers, it's simply him and his wife with a garage for 2 vehicles. Derek tells everyone "Don't research anything online, published books or otherwise" and try’s to discourage anyone from this.
He is always frustrated and about 2 seconds away from a heart attack, he doesn't listen and his "partner in crime Mila" is expected to patch up any issues Derek creates with any customers. 
I had to talk my best friend out of doing anything irrational because of the tons of money he spent for garbage workmanship by this extremely irritating little oompaloompa!
These jokers never give any info. such as the VIN# from the car a used engine came from, or documentation on the mileage not simply "Oh it's got less miles than yours and looks really nice!"
My friend just called him for some answers and I quote "If you want more horsepower out of your M3, buy another car!, I don't want to ever see that car again!"
Once a poor performance review was left, Derek texted his private phone and said to "man up, and fix this problem with Mila" then Derek left a voicemail totally harassing him! Unbelievable for any man or child, let alone a business.
He also had his M3 towed there when he had only about 120 miles on the "new engine" and the A/C belt was shredded (which means he did not install the A/C unit correctly or placed a severely used belt on it.)
Think they would fix there mistake and apologize? Not a chance, He was handed a bill for the work for about. $250.
I also get the feeling my friend was easily taken advantage of being a disabled U.S. Army, Infantry Veteran.
Nice work Derek!
I'm sure Mila can "man up" for your extremely poor and totally unprofessional performance!
DO NOT BRING YOUR VEHICLE TO PRECISION BMW REPAIR in Brentwood, NH.

First off horrible service and absolutely no time to answer questions once Derek has your money to pay for his flying lessons! 
Second the webpage looks like a big shop with a lot of experienced workers, it's simply him and his wife with a garage for 2 maybe 3 vehicles at most. Derek tells everyone "Don't research anything online, published books or otherwise" and if you're looking for any upgrades you'd be much better off with Helen Keller working on your vehicle with oven mitts on!!! He is always frustrated and about 2 seconds away from a heart attack, he doesn't listen and I feel sorry for Mila for she tries extremely hard. I've had to hold my temper back and refrain myself every time I asked a question to this extremely irritated individual.
I think when one pays $5,000 for a used engine block they would be more than willing to give any info. such as the VIN# from the car it came from, or documentation on the mileage not simply "Oh it's got less miles than yours and looks really nice!"
Also that was after I paid over $3,000 for parts and labor, meaning he doesn't care about repeat business???
I just called him for some answers and I quote "I don't want to see that car again!"
Absolutely Beautiful Derek!