Bill Clements
http://www.myspace.com/thebillclementsgroup
http://www.youtube.com/watch?v=QidJDI4Orhc
http://www.youtube.com/watch?v=D3h7fH592u8&feature=related

Crystalpalace
www.crystalpalacemusic.com

David Gonzalez:
http://www.myspace.com/davidgonzalezbass

Doug Johns:
http://dougjohns.com/

"The thing I love most about  Marco Basses are the harmonics. They are incredibly clear and crisp!" Doug Johns

Jauqo III-X
http://www.jauqoiii-x.com/
“I own a 6 string Fretgroove bass. It plays exceptionally well and is very comfortable and it has growl for days. The quality is well thought out and that really says a lot about the time that Marco puts into his basses.” Jauqo III-X

Robert Gifford
http://www.sometimeafter.com/
“Everyone that has heard me play the bass has been really impressed with the sound. I must say it's one of the best basses I've ever played. This bass has replaced all my others for studio and live work. I just wanted to say keep up the good work.” Robert Gifford

Erv Nagy
“First of all Marco Happy Thanksgiving to You and Yours! Also do you want to Buy 10 basses from me. Since I started using my Marco Bass the rest are just sitting in the Closet, I have received so many compliments on this Bass its incredible, since I've been known to play many Basses in my day, A lot of my fellow players are wondering WHY, I only use one now. Its taken me 40+ yrs to find the right one, its simple to play and operate, not like my Alembic which I've owned forever and still can't get that Marco passive pickup sound, I'm truly spoiled. Your loyal customer, I'm sure my next is the inverted fretless bass. Thanks Again for your excellent service and kindness, that I'm still trying to get used too. ” Erv Nagy

Nathaniel Daniel
http://www.myspace.com/28612518
“I can't put this thing down Marco! You are a genius. Seriously I stopped and played it twice on the way home and I haven't done anything but play this bass in like three hours! This bass is consistently amazing! Thanks Marco!” Daniel Nathaniel

Pennal Johnson
http://www.myspace.com/pennal/
“This Marco Bass has all of the natural elements of Feel, Sound, and Look I've been looking for a long time. It's a match made in Heaven.” Pennal Johnson

Justin Sakogawa
http://www.myspace.com/warscythemetal/
“I love the sound and the smoothness of my 5 string Fretgrove. Given the option to select either the neck or bridge pickup let's me get the tones I want, and adds a new dimensions to playing death metal. Killer tone, signature body; Marco's attention to detail is what makes his bass guitars so unique. This bass is sure to turn heads in the metal community.” Justin Sakogawa