Installation Price Of 750? Is it Worth it?

[tam421602]

Hey guys, i just got a qoute from this store name Al and Eds Auto Sound in Ontario, CA. The owner took a look of my audio equiments and told me that they'll do the installation for me along with making a custom box for me for a total of 750 dollars. Now my question is, is it worth it?
The owner claimed that they do a great job in installing everything and always made sure the wiring are done in a very clean way.

So, yeah, here are the stuff that i needed to install:
1. Kenwood DXN 7140 Head Unit
2. Alpine SPR-17S 6-1/2" Speakers along with the Tweeters
3. 12" Polkaudio Sub
4. Alphine PDX 500 AMP
5. Custom Box for the Sub

What do u guys think? Should i go ahead with it? or should i find another place to do it?

P.S. Al & Eds Auto Sound, Ontario, CA : Reviews and maps - Yahoo! Local
Yahoo showed a decent user review about this place, so yeah.

Thx in advance ^^