I have been considering it also although have not done it yet. I know a number of people on the Montana Owners Club web site have used this vendor to buy theirs and have been happy with them. I have not bought from them and am in no way associated with them so can't comment from personal experience.
I provided the fixtures used in constructing our trailer which use a G4 bulb. I just bought 10 of them from China for $10 and decided to see if I could destroy them so used two twelve volt in series and gently took them up to 23.5 V and two of the SMD's fell off once the solder melted. The reason to use LED's we do a great deal of boondocking.
Before we switched we read on here that many that didn't get the right "lums" when they bought and had to go back and get brighter ones etc. When we upgraded we just stopped in a RV store when we had RV with us and got the "lums" we needed. Changed it out in parking lot. Then replaced bulb by bulb as time went on. Started replacing where we used light the most(kitchen for us). Hardest part was buying a bulb that costs so much. But very happy with end results.
Made the change on our 22 foot sailboat a couple years ago and don't regret it a bit. Got a 10 pack of the fleabay 30 LED "bulbs" in the mail this week. Should be bright enough, only problem (if there is one) will be that they're more directional than a regular bulb so the light may not spread as much. I'm pretty sure we can live with it.
Well the pros are LEDs use about 15% of the power that incandescent bulbs use. As well as the obvious of extended battery life, it also means they run much cooler. You can also select the color that you like. Most incandescent bulbs are warm white while you can get LEDs in warm white, white or bluish white, or almost any color you like.
As I see it the cons are price. If you buy from American sellers you will pay about $10 - $15 per light. LEDs from China will cost from $2 - $7. They are all made in China anyway. There is also a great variability in quality from seller to seller. Before you buy a lot of them, buy 1 or 2 and see if you like them.
I have changed all of my coach lights to LED from China via eBay and am happy with them. They are great for off the grid camping.