Okay, let's get into the meaty bits then.
You've got your little FlySpy to scout out the room you're about to go into. It's a minidrone, so it has a Concealability of -2 to Perception tests for anyone in the room. You decide to use remote control to scout out the room. Using the Command program on your commlink* and your Pilot Aircraft (Remote Operations) skill 2 (+2 specialization), you get 10 dice to pilot it around the room. So, you scan out the room with it's Sensors (2), and you're able to make Perception checks with 8 dice (6 Command + 2 Sensor rating on the FlySpy). So you're able to fly it around the room and see all the guards in there without them noticing (Typical Sec Guard [SR4A, p. 281] has no Perception skill, defaults to Intuition [3] - 1 - 2 Concealability = 0 Dice). You're able to count up five guards and fly the drone back, or command it to hover out of the way while you breach the room and take out the guards.
*you sprung for the Rating 6 program since this is pretty important and the System 6 and Response 6 ratings on your commlink to run it, right? Otherwise, you're Command is limited by your System rating, which is limited by your Response. So if you have an average 'link, your Piloting check goes down.
But, what if you don't want to Remote Control it, since that's a Complex Action that could be better used making sure guards aren't sneaking up on you, or reloading your Ares Predator IV or something else. Okay, you send it a short command to fly around the room and broadcast it's sensor feed back to you. Now it has to rely on it's Pilot [3] and Response [Average device 3] ratings to fly around the room. You had a map of the building before you came in, so you know to instruct it's flight path to follow the walls. But, you didn't account for that one Troll guard that's leaning against the back wall. The drone flies toward him, but it's brain is registering an obstacle, so it has to roll it's 6 dice to see if it has the sense to fly around the obstacle [
Dog-Brain's Common Sense (6d6.hits(5)=3)]. It's a pretty savvy drone, so it knows not to fly into the guard and flys around it.
Now, sure the drone only costs you 2,000¥. But to run the drone with a Command R6 program, you're going to have to buy the program (300¥), a decent Commlink (Hermes Ikon - 3,000¥), upgrade it's Response to 6 (8,000¥), a decent 'link OS (Novatech Navi - 1,500¥) and upgrading it to System 6 (3,000¥). That's a 17,800¥ for you to scout out rooms ahead of you.
Looking at the Healer 'Bot, the best you can do is a Small drone (Since the Valkyrie Modification is a Standard Mod, meaning you can't put it into micro-/mini-drones). So, you stuff an Aztech Crawler with the Valkyrie Modification, filling the two slots it has left after it's standard Walker Mode modification. Now the little guy follows along behind you, healing you whenever your Bio-Monitor drops below X. It's got a rating 4 Medkit on board, so it's got 4 dice to stabilize and heal you. But it can only do so once for that set of wounds, can only heal a maximum of 4 boxes and the number of boxes healed is the net hits it gets over the 2 threshold. You could upgrade it to the max 6 Rating, giving your drone 6 dice to heal you up, but without help, the chances are it's going to stabilize you enough for you to try and escape.
And the cost of upgrading your Azzie Crawler to a Rating 6 Autodoc brings it to about 3,900¥ (1,700¥ for Crawler + 2,000¥ for Valkyrie mod + 200¥ to upgrade to rating 6 Medkit) plus the cost to hire the guy to build it for you since the mod isn't standard.
I'm not trying to say it isn't a good idea to have drones hanging around your character. Buy to do so, you're going to have to invest a bit more than just the cost of the drone. When you're first building your character, ever BP counts. Now, if you're a Prime Runner, I can definitely see this a being a part of their SOP and I'd love to see this in-game for those Prime Runners, just for the James Bond factor. Just be prepared for all the possibilities.