After a long time waiting for the right compressor for me along came the Omega Trail Charger. It checked off all the right boxes foe me: under 1k, made by an established manufacturer, backed by US retailer, able to fill small bottles and can run off of 12 volt (more of a bonus than an actual need for me). I read the entire owners manual and after following the start up procedures I did my first fill on a 48cuin tank. It took approx 19 min 0-3000psi. 
I was quite pleased with just how quiet it ran. For this first fill I used a small filter that I got while I waited for my larger "Airmega" filter.
I was also pleased that very little grease can thru the system to get trapped by the filter. After my larger filter came in I topped off my AT44, Wildcat .25 and 90cuin bottle (3500 to 4500psi). With the larger filter the run times were approximately 3-4 min (AT44 short w/reg), 5 min (Wildcat 300cc) and 24min on the 90cuin tank. These times are approximate (but very close) and follow the fill times listed by Omega. I was more focused on watching the compressor closely than watching the time. I will note here that I never exceeded the listed 30min max run time. The OTC never got hot. The cooling water and airflow got warm to the touch but not hot. I was really starting to like this unit..... until the 5th fill. On this fill the unit started to struggle at about 2200psi and stalled at 2500psi. I shut the unit off, purged the pressure and let it sit for 20 min. I tried it again using the included test plug and the same thing happened. If I had to make an educated guess I would say that one of the low pressure check valves failed and the resultant higher pressure on that piston stalled the unit. I looked at the parts diagram and noticed that there are 132 parts listed.
At this point I realized that I was going to return this compressor for a refund - not replacement. I am very mechanically inclined yet I would be hesitant about servicing this unit in the future. Maybe I just got that 1 in 100 unit that had an issue. I really wanted this to work for me and considered an exchange but returned it for reason stated. I have heard that the initial shipment of these (100 units) has sold out. I hope some other owners will chime in with their experiences.
On a side note. Airgun Depot provided me with excellent customer service thru the return process. This was my first purchase with them and I would not hesitate to do business with them again.
I was quite pleased with just how quiet it ran. For this first fill I used a small filter that I got while I waited for my larger "Airmega" filter.
I was also pleased that very little grease can thru the system to get trapped by the filter. After my larger filter came in I topped off my AT44, Wildcat .25 and 90cuin bottle (3500 to 4500psi). With the larger filter the run times were approximately 3-4 min (AT44 short w/reg), 5 min (Wildcat 300cc) and 24min on the 90cuin tank. These times are approximate (but very close) and follow the fill times listed by Omega. I was more focused on watching the compressor closely than watching the time. I will note here that I never exceeded the listed 30min max run time. The OTC never got hot. The cooling water and airflow got warm to the touch but not hot. I was really starting to like this unit..... until the 5th fill. On this fill the unit started to struggle at about 2200psi and stalled at 2500psi. I shut the unit off, purged the pressure and let it sit for 20 min. I tried it again using the included test plug and the same thing happened. If I had to make an educated guess I would say that one of the low pressure check valves failed and the resultant higher pressure on that piston stalled the unit. I looked at the parts diagram and noticed that there are 132 parts listed.
At this point I realized that I was going to return this compressor for a refund - not replacement. I am very mechanically inclined yet I would be hesitant about servicing this unit in the future. Maybe I just got that 1 in 100 unit that had an issue. I really wanted this to work for me and considered an exchange but returned it for reason stated. I have heard that the initial shipment of these (100 units) has sold out. I hope some other owners will chime in with their experiences.
On a side note. Airgun Depot provided me with excellent customer service thru the return process. This was my first purchase with them and I would not hesitate to do business with them again.
